Difflugia hi-res stock photography and images

Difflugia (Difflugia spec.), view into the mouth, pseudopodia sticked to the picture frame glass, Germany Stock Photo

RMCP06CY–Difflugia (Difflugia spec.), view into the mouth, pseudopodia sticked to the picture frame glass, Germany

Darkfield photomicrograph of a testate amoeba Difflugia bacillifera Stock Photo

RMBHJC7X–Darkfield photomicrograph of a testate amoeba Difflugia bacillifera

RF2JKPFKT–Stentor anatomy

schalenamÃ¶be (difflugia bacillariarum) Stock Photo

RFR2RNEB–schalenamÃ¶be (difflugia bacillariarum)

Difflugia pyriformis, amoebae Stock Photo

RMDTFH8M–Difflugia pyriformis, amoebae

. Difflugia spec 82 Difflugia spec. - - Print - Iconographia Zoologica - Special Collections University of Amsterdam - UBAINV0274 113 09 0024A Stock Photo

RMP25013–. Difflugia spec 82 Difflugia spec. - - Print - Iconographia Zoologica - Special Collections University of Amsterdam - UBAINV0274 113 09 0024A

RMDTF14Y–Difflugia Corona

RFD4R5B8–Some cells

Difflugia proteiformis, Print, Difflugia is the largest genus of Arcellinida, one of several groups of Tubulinea within the eukaryote supergroup Amoebozoa. Arcellinida species produce shells or tests from mineral particles or biogeonic elements (e.g. diatom frustules) and are thus commonly referred to as testate amoebae or shelled amoebae. Difflugia are particularly common in marshes and other freshwater habitats Stock Photo

RM2A2MFYT–Difflugia proteiformis, Print, Difflugia is the largest genus of Arcellinida, one of several groups of Tubulinea within the eukaryote supergroup Amoebozoa. Arcellinida species produce shells or tests from mineral particles or biogeonic elements (e.g. diatom frustules) and are thus commonly referred to as testate amoebae or shelled amoebae. Difflugia are particularly common in marshes and other freshwater habitats

RF2PX322D–stentor

conceptual illustration of some cells Stock Photo

RM2AY2GPR–conceptual illustration of some cells

. The Biological bulletin. Biology; Zoology; Marine biology. FEEDING OF DIFFLUGIA AND PONTIGULASIA 139. Plate I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Pr Stock Photo

RMRHKJ41–. The Biological bulletin. Biology; Zoology; Marine biology. FEEDING OF DIFFLUGIA AND PONTIGULASIA 139. Plate I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Pr

Archive image from page 31 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 1. Astasia Jiavicans. 2. Amblyophys viridis. 3. Euglena acits. 4. Chlorogonitim eitchlorum, 5. Co- lacium stentorum on a portion of the leg of a monocidiis. 6. Dintibryon sertularia. 7, 8, 9, 10, 11, 12, 13. Amoeba diffluens, exhibiting a few of its changes of form. The genera Difflugia, Arcella, and Cyphidium (1,2, 3, fig. 7) seem to be merely Amoebae endowed with a power of constructing for them- selves a carapax or shelly covering of various forms, from t Stock Photo

RMW271DA–Archive image from page 31 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 1. Astasia Jiavicans. 2. Amblyophys viridis. 3. Euglena acits. 4. Chlorogonitim eitchlorum, 5. Co- lacium stentorum on a portion of the leg of a monocidiis. 6. Dintibryon sertularia. 7, 8, 9, 10, 11, 12, 13. Amoeba diffluens, exhibiting a few of its changes of form. The genera Difflugia, Arcella, and Cyphidium (1,2, 3, fig. 7) seem to be merely Amoebae endowed with a power of constructing for them- selves a carapax or shelly covering of various forms, from t

Protozoa (Unicellular eukaryotic organisms). Stock Photo

RFCEGGB7–Protozoa (Unicellular eukaryotic organisms).

RFJB5H5T–conceptual illustration of some cells

Scientific Designing of Amoeba Structure. Colorful Symbols. Vector Illustration. Stock Vector

RF2KDN5EG–Scientific Designing of Amoeba Structure. Colorful Symbols. Vector Illustration.

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U.S.GEOLOGICAL SURVEY OF THE TERRITORIES. LATE XVI; â ^'?/^.;. 2l^..^^l^ h F âi L,i DIFFLUGIA . CORONA.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office Stock Photo

RMPG07XP–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U.S.GEOLOGICAL SURVEY OF THE TERRITORIES. LATE XVI; â ^'?/^.;. 2l^..^^l^ h F âi L,i DIFFLUGIA . CORONA.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

Darkfield photomicrograph of a testate amoeba Nebela carinata Difflugia sp Stock Photo

RMBHJDRC–Darkfield photomicrograph of a testate amoeba Nebela carinata Difflugia sp

. Difflugia proteiformis 82 Difflugia proteiformis - - Print - Iconographia Zoologica - Special Collections University of Amsterdam - UBAINV0274 113 09 0023 Stock Photo

RMP2500Y–. Difflugia proteiformis 82 Difflugia proteiformis - - Print - Iconographia Zoologica - Special Collections University of Amsterdam - UBAINV0274 113 09 0023

RFD4R5BM–Some cells

. Fig. i6. Wurzelfüsser des süssen Wassers in einem Wassertropfen an Algenfiiden sitzend bei starker Vergrösserung. i Difßugia urceolata — 2 Difßugi'a actitiiiiiata — 3 Difflugia spiralis — 4 Arcella vulgaris von der Seite und von oben — 5 Coifropy.vis acidleata — 6 Hyalosphenia papilio — 7 Quadrula symmetrica — 8 Cyphoderia antpulla — 9 Euglypha aheolaia. (Das Grössenverhältnis der hier abgebildeten Arten zu einander entspricht nicht genau der Wirklichkeit.) Stock Photo

RMMCNJAM–. Fig. i6. Wurzelfüsser des süssen Wassers in einem Wassertropfen an Algenfiiden sitzend bei starker Vergrösserung. i Difßugia urceolata — 2 Difßugi'a actitiiiiiata — 3 Difflugia spiralis — 4 Arcella vulgaris von der Seite und von oben — 5 Coifropy.vis acidleata — 6 Hyalosphenia papilio — 7 Quadrula symmetrica — 8 Cyphoderia antpulla — 9 Euglypha aheolaia. (Das Grössenverhältnis der hier abgebildeten Arten zu einander entspricht nicht genau der Wirklichkeit.)

RM2AY2H41–conceptual illustration of some cells

The principles of biology . fixed, either over part of the mass or over thewhole of it, we have kinds of synametry that correspondwith the habitual incidence of forces. An Ammha in be-coming encysted, which we may regard as the productionin it of a differentiation between superficial parts and centralparts, passes from an indefinite, ever-changing form Latoa spherical form; and the order of symmetry which it thusassumes, is in harmony with the average equality of theactions on all its sides. In Difflugia, Fig. 134, and stOlbetter in ArceUa, we have an indefinitely-radial symmetryoccurring wher Stock Photo

RM2AN3P3P–The principles of biology . fixed, either over part of the mass or over thewhole of it, we have kinds of synametry that correspondwith the habitual incidence of forces. An Ammha in be-coming encysted, which we may regard as the productionin it of a differentiation between superficial parts and centralparts, passes from an indefinite, ever-changing form Latoa spherical form; and the order of symmetry which it thusassumes, is in harmony with the average equality of theactions on all its sides. In Difflugia, Fig. 134, and stOlbetter in ArceUa, we have an indefinitely-radial symmetryoccurring wher

Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 ' FIG. 3. — Difflugia. A lobose FIG. 4. — Foraminifera. A, Biloculina with Rhizopod with a shell of extended pseudopodia (after Schultze); B, grains of sand. Common chambered shell of Globigerina. in fresh water. Order II. Foraminifera. Numerous slender pseudopo- dia which branch and unite to form networks. Nearly all are marine. Most species form calcareous shells which in many species increase with growth by adding addi- tional chambers to the original one. There is a terminal apert Stock Photo

RMRWPPC3–Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 ' FIG. 3. — Difflugia. A lobose FIG. 4. — Foraminifera. A, Biloculina with Rhizopod with a shell of extended pseudopodia (after Schultze); B, grains of sand. Common chambered shell of Globigerina. in fresh water. Order II. Foraminifera. Numerous slender pseudopo- dia which branch and unite to form networks. Nearly all are marine. Most species form calcareous shells which in many species increase with growth by adding addi- tional chambers to the original one. There is a terminal apert

RFJB5H61–conceptual illustration of some cells

RF2KDN5E5–Scientific Designing of Amoeba Structure. Colorful Symbols. Vector Illustration.

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U,S.r;E01XlGlCAL f^URVEY OF THE TERRITORIES. p; TK V. T>.Ts Sinclair i So/v Lith "DIFFLUGIA PYRIFORMIS.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office Stock Photo

RMPG081R–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U,S.r;E01XlGlCAL f^URVEY OF THE TERRITORIES. p; TK V. T>.Ts Sinclair i So/v Lith "DIFFLUGIA PYRIFORMIS.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

vintage, history, retro, photo, picture, image, copy, deduction, old, Stock Photo

RFJ9028G–vintage, history, retro, photo, picture, image, copy, deduction, old,

. Electro-physiology . the point represented in the diagram, it has already passed the point of excitation p; while at p, however, it has been trans- mitted as far as /. If its duration be termed (D), its length (L), and the rapidity of transmission (V), L-- VI). According to Bernstein's experiments, the value of (L) is between 198 and 380 mm. In contractile substances whose conductivity of excitation has been little developed, as, e.g., in Ehizopoda (Difflugia), it is at once evident on exciting locally that the resulting changes are most pronounced in the immediate neighbourhood of the point Stock Photo

RMMA79MK–. Electro-physiology . the point represented in the diagram, it has already passed the point of excitation p; while at p, however, it has been trans- mitted as far as /. If its duration be termed (D), its length (L), and the rapidity of transmission (V), L-- VI). According to Bernstein's experiments, the value of (L) is between 198 and 380 mm. In contractile substances whose conductivity of excitation has been little developed, as, e.g., in Ehizopoda (Difflugia), it is at once evident on exciting locally that the resulting changes are most pronounced in the immediate neighbourhood of the point

. The British freshwater Rhizopoda and Heliozoa. Fig. 13.—Early stage in the conjugation of Difflugia pyriformis,var. lacustris: two individuals approaching each other, theplasma of the one enveloping the oral aperture of the other,and the granular substance of the two animals commingling.A few minutes sufficed to bring the mouths of the tests closetogether. x 200. The cysts, so commonly observed in the testaceousRhizopoda {NeheJa, Difflugia, Enghjjylia, etc.) protectwhat are known as swarm-spores. The parentorganism splits up into separate cells, each cell pro-vided with its portion of the nu Stock Photo

RM2AFWB5A–. The British freshwater Rhizopoda and Heliozoa. Fig. 13.—Early stage in the conjugation of Difflugia pyriformis,var. lacustris: two individuals approaching each other, theplasma of the one enveloping the oral aperture of the other,and the granular substance of the two animals commingling.A few minutes sufficed to bring the mouths of the tests closetogether. x 200. The cysts, so commonly observed in the testaceousRhizopoda {NeheJa, Difflugia, Enghjjylia, etc.) protectwhat are known as swarm-spores. The parentorganism splits up into separate cells, each cell pro-vided with its portion of the nu

Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 PROTOZOA. size, occasionally tougher slender processes without granule streams (figs. 125 and 12G). Amcela prinrrps Ehrbg., A. tcrricola Greef., Pet/tlnjrtis diffvfi'tcnx Clnp. Lachm. Here should also be placed the famous Batlujliux Haecltdi Huxl., which is found in the' deep sea mud of the Atlantic Ocean, if it is indeed a living organism (and not simply a deposit of Gypsum). Arcella vulgaris Ehrbg., Difflugia proteif Stock Photo

RMRWK65A–Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 PROTOZOA. size, occasionally tougher slender processes without granule streams (figs. 125 and 12G). Amcela prinrrps Ehrbg., A. tcrricola Greef., Pet/tlnjrtis diffvfi'tcnx Clnp. Lachm. Here should also be placed the famous Batlujliux Haecltdi Huxl., which is found in the' deep sea mud of the Atlantic Ocean, if it is indeed a living organism (and not simply a deposit of Gypsum). Arcella vulgaris Ehrbg., Difflugia proteif

RF2KDN5E8–Scientific Designing of Amoeba Structure. Colorful Symbols. Vector Illustration.

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. IIS GEOLOGICAL"SURVEY OF THE TERRITORIES. PLATE Xin. mm.-^ Jcd Leidy.Es]. DIFFLUGIA ACUMINATA. :7iOB Sir,^l(.ir A Sop. Lit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office Stock Photo

RMPG07YP–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. IIS GEOLOGICAL"SURVEY OF THE TERRITORIES. PLATE Xin. mm.-^ Jcd Leidy.Es]. DIFFLUGIA ACUMINATA. :7iOB Sir,^l(.ir A Sop. Lit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

. Dr. Johannes Leunis Synopsis der thierkunde. Ein handbuch fÃ¼r hÃ¶here lehranstalten und fÃ¼r alle, welche sich wissenschaftlich mit der naturgeschichte der thiere beschÃ¤ftigen wollen . 5i9- 1156. Euglypha alveolÃ¤ta; 250/(. Uc6erfiiJ)t bcr tot(itiqften ^attunflcn bcr Arcelliilae, fÂ©(i()ale auÂ§ Ã¼ertittetcn grcmbfÃ¶rpern gebilbet, fugelig biS langgeftredt... 1) Difflugia. , 1 c o- â ^ fÃ¶cm 2Bei(^fÃ¶rper nicfet Â»Ã¶Ã¼ia auSqefÃ¼Ut, mit mÃ¤Ãig , Â©d^ale o^ne 5remb= | xantn, freiÂ«runber Oeffnnng...' 2) Arma. fÃ¶rper, fa^ipenfÃ¶rmig, Â»om JZBeic^tÃ¶r^er Ã¶ijttig auSgefÃ¼Ã¶t, mit fe(ir we Stock Photo

RMMAAM2J–. Dr. Johannes Leunis Synopsis der thierkunde. Ein handbuch fÃ¼r hÃ¶here lehranstalten und fÃ¼r alle, welche sich wissenschaftlich mit der naturgeschichte der thiere beschÃ¤ftigen wollen . 5i9- 1156. Euglypha alveolÃ¤ta; 250/(. Uc6erfiiJ)t bcr tot(itiqften ^attunflcn bcr Arcelliilae, fÂ©(i()ale auÂ§ Ã¼ertittetcn grcmbfÃ¶rpern gebilbet, fugelig biS langgeftredt... 1) Difflugia. , 1 c o- â ^ fÃ¶cm 2Bei(^fÃ¶rper nicfet Â»Ã¶Ã¼ia auSqefÃ¼Ut, mit mÃ¤Ãig , Â©d^ale o^ne 5remb= | xantn, freiÂ«runber Oeffnnng...' 2) Arma. fÃ¶rper, fa^ipenfÃ¶rmig, Â»om JZBeic^tÃ¶r^er Ã¶ijttig auSgefÃ¼Ã¶t, mit fe(ir we

. The British freshwater Rhizopoda and Heliozoa. Fig. 7.—Test oi Hyalosphenia papilio. x about iioO. Fia. 8.—Testof Difflugia pyriformis (a oomiuon form) encrusted -vrith sand-grains. X 200. Euglypha alveolata G-ruber concluded that there was adevelopment, within the protoplasmic body, of thenecessary materials—chitin, cellulose, or silica—bychemical agency. Diaphanous plates of varied pattern,circular or oval {Nebela, etc.), polygonal (someEuglyphse); quadrangular {Quadrula); or of no definitegeometrical figure, are secreted; and during mitosis(reproductive fission) these so arrange themselve Stock Photo

RM2AFWC9N–. The British freshwater Rhizopoda and Heliozoa. Fig. 7.—Test oi Hyalosphenia papilio. x about iioO. Fia. 8.—Testof Difflugia pyriformis (a oomiuon form) encrusted -vrith sand-grains. X 200. Euglypha alveolata G-ruber concluded that there was adevelopment, within the protoplasmic body, of thenecessary materials—chitin, cellulose, or silica—bychemical agency. Diaphanous plates of varied pattern,circular or oval {Nebela, etc.), polygonal (someEuglyphse); quadrangular {Quadrula); or of no definitegeometrical figure, are secreted; and during mitosis(reproductive fission) these so arrange themselve

Archive image from page 155 of Die Tier- und Pflanzenwelt des Die Tier- und Pflanzenwelt des Süsswassers : Einführung in das Studium derselben dietierundpflanz01zach Year: 1891 140 ° Wurzelfüsser des Süsswassers in Bau und Lebenserscheinungen. Fig. i6. Wurzelfüsser des süssen Wassers in einem Wassertropfen an Algenfiiden sitzend bei starker Vergrösserung. i Difßugia urceolata — 2 Difßugi'a actitiiiiiata — 3 Difflugia spiralis — 4 Arcella vulgaris von der Seite und von oben — 5 Coifropy.vis acidleata — 6 Hyalosphenia papilio — 7 Quadrula symmetrica — 8 Cyphoderia antpulla — 9 Euglypha aheo Stock Photo

RMT23E5C–Archive image from page 155 of Die Tier- und Pflanzenwelt des Die Tier- und Pflanzenwelt des Süsswassers : Einführung in das Studium derselben dietierundpflanz01zach Year: 1891 140 ° Wurzelfüsser des Süsswassers in Bau und Lebenserscheinungen. Fig. i6. Wurzelfüsser des süssen Wassers in einem Wassertropfen an Algenfiiden sitzend bei starker Vergrösserung. i Difßugia urceolata — 2 Difßugi'a actitiiiiiata — 3 Difflugia spiralis — 4 Arcella vulgaris von der Seite und von oben — 5 Coifropy.vis acidleata — 6 Hyalosphenia papilio — 7 Quadrula symmetrica — 8 Cyphoderia antpulla — 9 Euglypha aheo

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. IJ^S GEOLOGICAL SURVEY OF THE TERRITORIES. PLATE XI. s-Leidy Dei Uu h .-.m.Lith DIFFLUGIA PYRIFORmS. 1 - 6 VAR. COMPRESSA 7-2SVAK. NODOSA,,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office Stock Photo

RMPG081P–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. IJ^S GEOLOGICAL SURVEY OF THE TERRITORIES. PLATE XI. s-Leidy Dei Uu h .-.m.Lith DIFFLUGIA PYRIFORmS. 1 - 6 VAR. COMPRESSA 7-2SVAK. NODOSA,,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

Zöology; a textbook for colleges and universities . re usual to write Amoeba. 192 ZOOLOGY Ciliates orInfusoria tractile vacuole, and also frequently various objects takenin as food. Many other rhizopods form shells ofvarious kinds, often looking like little jars or flasks, orflattened and circular, like buttons. In one genus(Quadrulella) the shell is composed of quadrangularplates ; in another (Difflugia) it consists principally ofsand grains united together by a secretion of the animal.In one family the pseudopodia are threadlike. Related to the Rhizopoda are the Heliozoa or sunanimalcules, a Stock Photo

RM2AWD4YB–Zöology; a textbook for colleges and universities . re usual to write Amoeba. 192 ZOOLOGY Ciliates orInfusoria tractile vacuole, and also frequently various objects takenin as food. Many other rhizopods form shells ofvarious kinds, often looking like little jars or flasks, orflattened and circular, like buttons. In one genus(Quadrulella) the shell is composed of quadrangularplates ; in another (Difflugia) it consists principally ofsand grains united together by a secretion of the animal.In one family the pseudopodia are threadlike. Related to the Rhizopoda are the Heliozoa or sunanimalcules, a

Dr Johannes Leunis Synopsis der Dr. Johannes Leunis Synopsis der thierkunde. Ein handbuch fÃ¼r hÃ¶here lehranstalten und fÃ¼r alle, welche sich wissenschaftlich mit der naturgeschichte der thiere beschÃ¤ftigen wollen drjohannesleuni02leun Year: 1883 5i9- 1156. Euglypha alveolÃ¤ta; 250/(. Uc6erfiiJ)t bcr tot(itiqften ^attunflcn bcr Arcelliilae, fÂ(i()ale auÂ§ Ã¼ertittetcn grcmbfÃ¶rpern gebilbet, fugelig biS langgeftredt... 1) Difflugia. , 1 c o- â ^ fÃ¶cm 2Bei(^fÃ¶rper nicfet Â»Ã¶Ã¼ia auSqefÃ¼Ut, mit mÃ¤Ãig , Âd^ale o^ne 5remb= | xantn, freiÂ«runber Oeffnnng...' 2) Arma. fÃ¶rper, fa^ipenfÃ Stock Photo

RMT0W16H–Dr Johannes Leunis Synopsis der Dr. Johannes Leunis Synopsis der thierkunde. Ein handbuch fÃ¼r hÃ¶here lehranstalten und fÃ¼r alle, welche sich wissenschaftlich mit der naturgeschichte der thiere beschÃ¤ftigen wollen drjohannesleuni02leun Year: 1883 5i9- 1156. Euglypha alveolÃ¤ta; 250/(. Uc6erfiiJ)t bcr tot(itiqften ^attunflcn bcr Arcelliilae, fÂ(i()ale auÂ§ Ã¼ertittetcn grcmbfÃ¶rpern gebilbet, fugelig biS langgeftredt... 1) Difflugia. , 1 c o- â ^ fÃ¶cm 2Bei(^fÃ¶rper nicfet Â»Ã¶Ã¼ia auSqefÃ¼Ut, mit mÃ¤Ãig , Âd^ale o^ne 5remb= | xantn, freiÂ«runber Oeffnnng...' 2) Arma. fÃ¶rper, fa^ipenfÃ

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 36 BEITISH FEESHWATER RHIZOPODA. figures with any known species of Difflugia. The D. glohulosa of modern authors is well known as having a globose or hemispherical test, with an oral aperture â â-comparatively largeâsituated not at the extremity of an ovoid body, but on the basal surface (in this case the ventral surface) of the hemisphereâa quite different arrangement. But if we cannot accept D. glob'idosa Duj. on account of its ambiguity, still less is it permissible to perpetuate a name which the autho Stock Photo

RMPG1A4M–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 36 BEITISH FEESHWATER RHIZOPODA. figures with any known species of Difflugia. The D. glohulosa of modern authors is well known as having a globose or hemispherical test, with an oral aperture â â-comparatively largeâsituated not at the extremity of an ovoid body, but on the basal surface (in this case the ventral surface) of the hemisphereâa quite different arrangement. But if we cannot accept D. glob'idosa Duj. on account of its ambiguity, still less is it permissible to perpetuate a name which the autho

. Journal of experimental zoology. e made in the usual way by watching the forms from above. I used Difflugia acuminata, D. spirahs,Amoeba proteus, A. Umax, A. verrucosa, A. radiosa and severalsmall forms of Amoeba which I did not determine. Amoebaproteus was especially well suited to my purpose, as it was largeenough to be easily seen with the unaided eye. • Difflug I a Difflugia acuminata extends a slender pseudopod to its fulllength free in the water. That it is free is evident from itsmotions. The pseudopod then becomes attached at its tip (Fig. 6)and contracts, drawing the mouth of the sh Stock Photo

RM2AGEGE2–. Journal of experimental zoology. e made in the usual way by watching the forms from above. I used Difflugia acuminata, D. spirahs,Amoeba proteus, A. Umax, A. verrucosa, A. radiosa and severalsmall forms of Amoeba which I did not determine. Amoebaproteus was especially well suited to my purpose, as it was largeenough to be easily seen with the unaided eye. • Difflug I a Difflugia acuminata extends a slender pseudopod to its fulllength free in the water. That it is free is evident from itsmotions. The pseudopod then becomes attached at its tip (Fig. 6)and contracts, drawing the mouth of the sh

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. a BKITISH FRESHWATER EHIZOPODA. Althougli this species is now almost universally called Diffliigia pyriformis, Ehrenberg's name has the priority and must be adopted in accordance with the rules of zoological nomenclature. "While there can moreover be no question as to the species being Ehrenberg's Difflugia oblonga, its identity with the pyriformis of Perty admits of doubt; indeed from its smooth outline, slender neck, and nearly regular mark- ings, Perty's figure may represent a Nebela. [From the de Stock Photo

RMPG1A6E–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. a BKITISH FRESHWATER EHIZOPODA. Althougli this species is now almost universally called Diffliigia pyriformis, Ehrenberg's name has the priority and must be adopted in accordance with the rules of zoological nomenclature. "While there can moreover be no question as to the species being Ehrenberg's Difflugia oblonga, its identity with the pyriformis of Perty admits of doubt; indeed from its smooth outline, slender neck, and nearly regular mark- ings, Perty's figure may represent a Nebela. [From the de

The royal natural history . ircular hole, through which short lobose pseudopods emerge from the body in the interior of the dome - like box. Arcella is capable of secreting vesicles of air in its body-substance, whereby it is enabled to rise. In Euglypha the shell is sac-shaped, with a jagged free margin, and the surface covered with regular overlapping scales. In Difflugia the shell is strengthened by the addition of foreign particles. Amoebas are cosmopolitan; occurring in sea and in fresh water, and a few living in mosses or damp earth. Certain forms of dysentery are said to be due to amoeb Stock Photo

RM2AN2NN1–The royal natural history . ircular hole, through which short lobose pseudopods emerge from the body in the interior of the dome - like box. Arcella is capable of secreting vesicles of air in its body-substance, whereby it is enabled to rise. In Euglypha the shell is sac-shaped, with a jagged free margin, and the surface covered with regular overlapping scales. In Difflugia the shell is strengthened by the addition of foreign particles. Amoebas are cosmopolitan; occurring in sea and in fresh water, and a few living in mosses or damp earth. Certain forms of dysentery are said to be due to amoeb

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U.S^ GEOLOGICAL SURVEY Of T'HE TERRlTfiRI:ES. PLATE XV. Sofc Sinoia-.r ft Sjn. L.i 14 DIFFLUGIA LOBOSTOMA. 26-31 D.GLOBULOSA. 32- 33 D .PYRIFCRMIS.34-37 D.ARCULA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office Stock Photo

RMPG07Y8–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U.S^ GEOLOGICAL SURVEY Of T'HE TERRlTfiRI:ES. PLATE XV. Sofc Sinoia-.r ft Sjn. L.i 14 DIFFLUGIA LOBOSTOMA. 26-31 D.GLOBULOSA. 32- 33 D .PYRIFCRMIS.34-37 D.ARCULA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

Text-book of comparative anatomy . Fio. 1.—Amoeba polypodia in the successive stages of division. The light spot is the contractilevaruole, the dark the nucleus (after F. E. Schulze).. Fio. -2.—A. Quadrula symmetrica, after F. E. Schulze. /;, Hyalosphenia lata, after F. E.Schulze. C, Arcella vulgaris, after Hertwig and Lesser. D, Difflugia pyriformis (after Wal-lich) completed. 4 COMPARATIVE ANATOMY CHAP, i Protista, consisting of the simplest organisms. But there is also nosharp line of demarcation between the Prntixta on the one side andanimals and plants on the other. Some Protista are, chi Stock Photo

RM2AWKAMM–Text-book of comparative anatomy . Fio. 1.—Amoeba polypodia in the successive stages of division. The light spot is the contractilevaruole, the dark the nucleus (after F. E. Schulze).. Fio. -2.—A. Quadrula symmetrica, after F. E. Schulze. /;, Hyalosphenia lata, after F. E.Schulze. C, Arcella vulgaris, after Hertwig and Lesser. D, Difflugia pyriformis (after Wal-lich) completed. 4 COMPARATIVE ANATOMY CHAP, i Protista, consisting of the simplest organisms. But there is also nosharp line of demarcation between the Prntixta on the one side andanimals and plants on the other. Some Protista are, chi

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 105 and 106.— Difflugia tuherculata : 105, lateral view; 106, oral view. Outlines derived from Wallioh's and Penard's figures, x 200. As in the case of several other rhizopods which Archer found in Ireland and exhibited before the Dublin Microscopical Club, he omitted to give the locality. That the species does occur in Ireland has recently been confirmed by Dr. Penard. Wallich described Difflugia tuherculata, as of varietal rank only, in the-'Annals of Natural History' for March, 1867, without givi Stock Photo

RMPG19W8–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 105 and 106.— Difflugia tuherculata : 105, lateral view; 106, oral view. Outlines derived from Wallioh's and Penard's figures, x 200. As in the case of several other rhizopods which Archer found in Ireland and exhibited before the Dublin Microscopical Club, he omitted to give the locality. That the species does occur in Ireland has recently been confirmed by Dr. Penard. Wallich described Difflugia tuherculata, as of varietal rank only, in the-'Annals of Natural History' for March, 1867, without givi

Zöology; a textbook for colleges and universities . c Drawing by R. Weber FIG. 3g. Stages in the development of Didymium, one of the Mycetozoa (afterLister); magnified about 1400 diameters. A, Spore. B, Swarm cell escaping froma spore case. C, Swarm cell; /, flagellum. PROTOZOA 191 give rise to a great number of smaller organisms. Inthe malaria parasite, which is conveyed to man by the. Drawing by R. Weber (after Leidy) FIG. 40. Shells of three species of Difflugia. A, D. capreolata. B, D. corona.C, D. acuminala, variety inflata. Although Difflugia. corona presents markedvariations, it never a Stock Photo

RM2AWD5AP–Zöology; a textbook for colleges and universities . c Drawing by R. Weber FIG. 3g. Stages in the development of Didymium, one of the Mycetozoa (afterLister); magnified about 1400 diameters. A, Spore. B, Swarm cell escaping froma spore case. C, Swarm cell; /, flagellum. PROTOZOA 191 give rise to a great number of smaller organisms. Inthe malaria parasite, which is conveyed to man by the. Drawing by R. Weber (after Leidy) FIG. 40. Shells of three species of Difflugia. A, D. capreolata. B, D. corona.C, D. acuminala, variety inflata. Although Difflugia. corona presents markedvariations, it never a

. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. GENUS NEBELA—NEBELA COLLAEIS. 151 In all other respects, the forms agree with the varieties of N. collaris, hut I have never met with specimens in which the shell was otherwise than com- pressed. Mr. Carter, in the same work, described a form under the name of Difflugia peltigeracea, which probably also belongs to the same animal as Nebela collaris. The nature of the singularly varied shell of Nebela collaris I have not been able to determine with any satisfaction. In the characteristic forms, the elements of structure, t Stock Photo

RMPG0845–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. GENUS NEBELA—NEBELA COLLAEIS. 151 In all other respects, the forms agree with the varieties of N. collaris, hut I have never met with specimens in which the shell was otherwise than com- pressed. Mr. Carter, in the same work, described a form under the name of Difflugia peltigeracea, which probably also belongs to the same animal as Nebela collaris. The nature of the singularly varied shell of Nebela collaris I have not been able to determine with any satisfaction. In the characteristic forms, the elements of structure, t

RMRDE1T6–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. U.S.GEOLOGICAL SURVEY OF THE TERRITORIES. LATE XVI; â ^'?/^.;. 2l^..^^l^ h F âi L,i DIFFLUGIA . CORONA.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 63 ® Figs. 61-63.—Diagrammatic oral views of the tests of (61) the 3-lobed form of Difflugia lobostoma, (62) D. " tricuspis " (after Carter), and (63) D. gramen. Upon the confusion in nomenclature which has arisen Leidy observes (under D. lobostoma) : " As ordinarily seen it [the test] bears so close a resemblance with the corresponding views of D. proteiformis as des- cribed and figured by Ehrenberg, that it may not only be readily taken for the same, but I have suspected that Ehrenberg ma Stock Photo

RMPG1A33–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 63 ® Figs. 61-63.—Diagrammatic oral views of the tests of (61) the 3-lobed form of Difflugia lobostoma, (62) D. " tricuspis " (after Carter), and (63) D. gramen. Upon the confusion in nomenclature which has arisen Leidy observes (under D. lobostoma) : " As ordinarily seen it [the test] bears so close a resemblance with the corresponding views of D. proteiformis as des- cribed and figured by Ehrenberg, that it may not only be readily taken for the same, but I have suspected that Ehrenberg ma

. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. Protozoa and Rotifera at Havana, III. 321. Fig. 1, Difflugia fra- gosa, n. sp. Lateral view.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Illinois State Laboratory of Natural History. Bloomington, Ill. : The Laboratory Stock Photo

RMRGE68G–. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. Protozoa and Rotifera at Havana, III. 321. Fig. 1, Difflugia fra- gosa, n. sp. Lateral view.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Illinois State Laboratory of Natural History. Bloomington, Ill. : The Laboratory

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA GLOBULUS. 37 reticular venation is not shown in his figure, which cer- tainly represents a sand-covered species which can only be that under consideration. It is probable that in 1856 he figured a different example from the one he described in 1848. Those which appear in his ' Mikrogeologie' (1854) under the same name are neither sand-covered nor veined, and may not be the same species, most probably being Gentropyxis ecornis, a view apparently held by Leidy. (See ' Freshw. Rhiz. N. Amer.,' p. 3 Stock Photo

RMPG1A4C–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA GLOBULUS. 37 reticular venation is not shown in his figure, which cer- tainly represents a sand-covered species which can only be that under consideration. It is probable that in 1856 he figured a different example from the one he described in 1848. Those which appear in his ' Mikrogeologie' (1854) under the same name are neither sand-covered nor veined, and may not be the same species, most probably being Gentropyxis ecornis, a view apparently held by Leidy. (See ' Freshw. Rhiz. N. Amer.,' p. 3

. Bulletin. Natural history; Natural history. Protozoa and Rotifera at Havana, III. 321. Fig. 1, Difflugia fra gosa, n. sp. Lateral view.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division Stock Photo

RMRGWHNN–. Bulletin. Natural history; Natural history. Protozoa and Rotifera at Havana, III. 321. Fig. 1, Difflugia fra gosa, n. sp. Lateral view.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fi«. 60.—Difflugia proteiformis Ehrenb. Three aspects of the same individual. ? = D. lobostoma. After Ehrenberg, ' Infns.' t. ix. f. 1 a-c (reduced), x 200. In our remarks on D: ohlonga, Ehrenb. reference is made to the uncertainty regarding the particular organism^ to which Ehrenberg apphed the name D. proteiformis. There is more probability of the author having had before him examples of D. lobostoma —judging from his figures—than any other rhizopod. 61. Please note that these images are extracted from Stock Photo

RMPG1A3A–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fi«. 60.—Difflugia proteiformis Ehrenb. Three aspects of the same individual. ? = D. lobostoma. After Ehrenberg, ' Infns.' t. ix. f. 1 a-c (reduced), x 200. In our remarks on D: ohlonga, Ehrenb. reference is made to the uncertainty regarding the particular organism^ to which Ehrenberg apphed the name D. proteiformis. There is more probability of the author having had before him examples of D. lobostoma —judging from his figures—than any other rhizopod. 61. Please note that these images are extracted from

$. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 345 mella) or the slime by which the animals adhere to the substratum {^Amoeba, Difflugia, Polystomella). Beside these results should be placed the well-known fact that dissevered nerve-fibres in the higher animals are only regenerated from that end which remains in con- nection with the nerve-cell, while the remaining portion invariably degenerates. J. A. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and Stock Photo$

RMRJBBE1–. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 345 mella) or the slime by which the animals adhere to the substratum {^Amoeba, Difflugia, Polystomella). Beside these results should be placed the well-known fact that dissevered nerve-fibres in the higher animals are only regenerated from that end which remains in con- nection with the nerve-cell, while the remaining portion invariably degenerates. J. A. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fig. 51.—Difflugia globulosa Dujardin :? — D. lobostoma. After Dujardin, in Ann. Sci. Nat., 2, VII (1837), t. ix, ff. 1 a, 1 6. x about 200. ' Annals and Magazine of Natural History' for 1864. The species we have hitherto known as D. globulosa Duj. is there referred to, and figured, as " Difflugia globularis Duj."—obviously an error, which the writer has repeated throughout his paper. There was no "D. glohularin" known when Wallich, apparently imconscious of his error, invented the nam Stock Photo

RMPG1A4H–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fig. 51.—Difflugia globulosa Dujardin :? — D. lobostoma. After Dujardin, in Ann. Sci. Nat., 2, VII (1837), t. ix, ff. 1 a, 1 6. x about 200. ' Annals and Magazine of Natural History' for 1864. The species we have hitherto known as D. globulosa Duj. is there referred to, and figured, as " Difflugia globularis Duj."—obviously an error, which the writer has repeated throughout his paper. There was no "D. glohularin" known when Wallich, apparently imconscious of his error, invented the nam

. A critique of the theory of evolution. Evolution; Evolution. THEORY OF EVOLUTION 185 several nuclei and in addition there is scattered material or particles called chromidia that are. Fig. 91. Difflugia Corona. (After Cash.) supposed to be chromatic in nature and related to the material of the nuclei, possibly by direct interchange. When Difflugia divides, part of the proto- plasm protrudes from the opening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence tha Stock Photo

RMRE5B9Y–. A critique of the theory of evolution. Evolution; Evolution. THEORY OF EVOLUTION 185 several nuclei and in addition there is scattered material or particles called chromidia that are. Fig. 91. Difflugia Corona. (After Cash.) supposed to be chromatic in nature and related to the material of the nuclei, possibly by direct interchange. When Difflugia divides, part of the proto- plasm protrudes from the opening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence tha

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. LESQUEEEUSIA SPIEALIS. 69 line is continued in a straight line down to the mouth; the orifice circular, contracted, its margin plain and sharply defined; the surrounding membrane thin. The plasma pale yellow, as seen through the trans- parent test; nucleus single, situated posteriorly; the pseudopodia as in Difflugia, long, blunt, simple, or branched.. Fig. 75.—Lesquereusia spiralis, showing the " vermiform pellets " re- presented only on part of the test. Terrington, W. Torks. From a drawing by Stock Photo

RMPG1A1Y–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. LESQUEEEUSIA SPIEALIS. 69 line is continued in a straight line down to the mouth; the orifice circular, contracted, its margin plain and sharply defined; the surrounding membrane thin. The plasma pale yellow, as seen through the trans- parent test; nucleus single, situated posteriorly; the pseudopodia as in Difflugia, long, blunt, simple, or branched.. Fig. 75.—Lesquereusia spiralis, showing the " vermiform pellets " re- presented only on part of the test. Terrington, W. Torks. From a drawing by

RMRDE218–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. IJ^S GEOLOGICAL SURVEY OF THE TERRITORIES. PLATE XI. s-Leidy Dei Uu h .-.m.Lith DIFFLUGIA PYRIFORmS. 1 - 6 VAR. COMPRESSA 7-2SVAK. NODOSA,,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Leidy, Joseph, 1823-1891. Washington, Government Printing Office

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. ^)?f>?ff?y .,"j<'?.. Fia. 68.—Oblique view of ordinary form of Difflugia constricta. x 300. Fia. 69.—Front view of spined form of the same, x 320. sp. nov. — simulates D. constricta in the form of its test, and might easily be confounded with it in the absence of the living organism. Small spineless forms of 1). constricta occur in nearly every tuft of moss found growing in moist places, where the supply of moisture is intermittent the tests have always a depauperated appearance. Genus 19. FO Stock Photo

RMPG1A2D–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. ^)?f>?ff?y .,"j<'?.. Fia. 68.—Oblique view of ordinary form of Difflugia constricta. x 300. Fia. 69.—Front view of spined form of the same, x 320. sp. nov. — simulates D. constricta in the form of its test, and might easily be confounded with it in the absence of the living organism. Small spineless forms of 1). constricta occur in nearly every tuft of moss found growing in moist places, where the supply of moisture is intermittent the tests have always a depauperated appearance. Genus 19. FO

. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. HEREDITY IN THE PROTOZOA 289. Pig. 67.—Parent and immediate offspring in 6 diverse strains or families of Difflugia corona, to show the variation and the inheritance by the progeny of the parental diversities. (After Jennings.) individuals, and allowing their offspring to multiply, forming a population. The members of such a group were then measured. It was found that the charac- ter at first selected was present in the offspring. In some cases selection ceased after a certain peculi-. Please note that these images are Stock Photo

RMRDP8R2–. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. HEREDITY IN THE PROTOZOA 289. Pig. 67.—Parent and immediate offspring in 6 diverse strains or families of Difflugia corona, to show the variation and the inheritance by the progeny of the parental diversities. (After Jennings.) individuals, and allowing their offspring to multiply, forming a population. The members of such a group were then measured. It was found that the charac- ter at first selected was present in the offspring. In some cases selection ceased after a certain peculi-. Please note that these images are

. A manual of zoology. 20 MANUAL OF ZOOLOGY shot. body within the shell (Stokes). An even commoner member of the group is Arcella (Fig. 3, C). Arcella has a shell much wider than that of Difflugia, convex on one side, flat on the other. In the middle of the flat surface is a rounded opening. The shell of Arcella is of a transparent, tough. Fig. 3.—A, Quadrula symmetrica; B, Hyalosphenia lata; C, Arcella vulgaris; D, Difflugia pyriformis. (From Lang's Comparative Anatomy, after Schulze and Wallich.) material, which is said to be chitinoid from the fact that it appears to resemble a substance te Stock Photo

RMPG3PPG–. A manual of zoology. 20 MANUAL OF ZOOLOGY shot. body within the shell (Stokes). An even commoner member of the group is Arcella (Fig. 3, C). Arcella has a shell much wider than that of Difflugia, convex on one side, flat on the other. In the middle of the flat surface is a rounded opening. The shell of Arcella is of a transparent, tough. Fig. 3.—A, Quadrula symmetrica; B, Hyalosphenia lata; C, Arcella vulgaris; D, Difflugia pyriformis. (From Lang's Comparative Anatomy, after Schulze and Wallich.) material, which is said to be chitinoid from the fact that it appears to resemble a substance te

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENT AND RESPONSE IN DIFFLUGIA 235 the tip and consequently never became a part of the plasmagel. This resulted in a very definite differentiation between the plasmasol and the plasmagel, the former being green and the latter greyish. The following day movement continued in the same way but the specimens were less active, and 24 hours later all of the specimens were. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th Stock Photo

RMRHMTA3–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENT AND RESPONSE IN DIFFLUGIA 235 the tip and consequently never became a part of the plasmagel. This resulted in a very definite differentiation between the plasmasol and the plasmagel, the former being green and the latter greyish. The following day movement continued in the same way but the specimens were less active, and 24 hours later all of the specimens were. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFPLUGIA LOBOSTOMA. 47 stages. There is no conclusive evidence, however, that they do so. The sinuses in the three-lobed or four-lobed mouth of D. lobostoma are deeper and wider than those of the multi-lobed mouth of D. corona, not to mention other disparities in the tests of the two species.. Fi«. 60.—Difflugia proteiformis Ehrenb. Three aspects of the same individual. ? = D. lobostoma. After Ehrenberg, ' Infns.' t. ix. f. 1 a-c (reduced), x 200. In our remarks on D: ohlonga, Ehrenb. reference is made t Stock Photo

RMPG1A3F–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFPLUGIA LOBOSTOMA. 47 stages. There is no conclusive evidence, however, that they do so. The sinuses in the three-lobed or four-lobed mouth of D. lobostoma are deeper and wider than those of the multi-lobed mouth of D. corona, not to mention other disparities in the tests of the two species.. Fi«. 60.—Difflugia proteiformis Ehrenb. Three aspects of the same individual. ? = D. lobostoma. After Ehrenberg, ' Infns.' t. ix. f. 1 a-c (reduced), x 200. In our remarks on D: ohlonga, Ehrenb. reference is made t

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 3. Camera outlines of pseudopods of Difflugia pyrifonnis, illustrating contraction without attachment to the substratum. A, pseudopod fully extended; B and C, stages in contraction. Note that during contraction numerous hyaline blisters form on the surface. This is due to localized thickening of the hyaline layer. The thickness of the plasmagel increases markedly when the hyaline blisters form. evident in specimens in which the shell is firmly held by the pressure of the cover-glass than it is in those in which the shel Stock Photo

RMRHMTD3–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 3. Camera outlines of pseudopods of Difflugia pyrifonnis, illustrating contraction without attachment to the substratum. A, pseudopod fully extended; B and C, stages in contraction. Note that during contraction numerous hyaline blisters form on the surface. This is due to localized thickening of the hyaline layer. The thickness of the plasmagel increases markedly when the hyaline blisters form. evident in specimens in which the shell is firmly held by the pressure of the cover-glass than it is in those in which the shel

. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1. Astasia Jiavicans. 2. Amblyophys viridis. 3. Euglena acits. 4. Chlorogonitim eitchlorum, 5. Co- lacium stentorum on a portion of the leg of a monocidiis. 6. Dintibryon sertularia. 7, 8, 9, 10, 11, 12, 13. Amoeba diffluens, exhibiting a few of its changes of form. The genera Difflugia, Arcella, and Cyphidium (1,2, 3, fig. 7) seem to be merely Amoebae endowed with a power of constructing for them- selves a carapax or shelly covering of various forms, from the orifices of which the fluent body of the animalcules can be m Stock Photo

RMPFN822–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1. Astasia Jiavicans. 2. Amblyophys viridis. 3. Euglena acits. 4. Chlorogonitim eitchlorum, 5. Co- lacium stentorum on a portion of the leg of a monocidiis. 6. Dintibryon sertularia. 7, 8, 9, 10, 11, 12, 13. Amoeba diffluens, exhibiting a few of its changes of form. The genera Difflugia, Arcella, and Cyphidium (1,2, 3, fig. 7) seem to be merely Amoebae endowed with a power of constructing for them- selves a carapax or shelly covering of various forms, from the orifices of which the fluent body of the animalcules can be m

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA CONSTRICTA. .43 var. ecornis (Ehrenb.) Leidj, are often similar to the accepted type of D. constricta. In both species the test is chitinous and more or less covered with extraneous particles; if these consist of closely-set grains of sand or silicious plates entirely hiding the chitinous membrane and giving a grey colour to the test, it is identified with D. conatricta; when however the adherent matter is more or less scattered, leaving parts of the chitinous membrane exposed, and the test is o Stock Photo

RMRE1JPK–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA CONSTRICTA. .43 var. ecornis (Ehrenb.) Leidj, are often similar to the accepted type of D. constricta. In both species the test is chitinous and more or less covered with extraneous particles; if these consist of closely-set grains of sand or silicious plates entirely hiding the chitinous membrane and giving a grey colour to the test, it is identified with D. conatricta; when however the adherent matter is more or less scattered, leaving parts of the chitinous membrane exposed, and the test is o

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fias. 38 AND 39.—Difflugia oblonga : 38, common form incrusted with sand-grains, x 200 ; 39, a peculiar form from Clapham, W. Torks, chiefly incrusted with diatoms, x 310. The latter reduced from a drawing by G. S. West. name proteiformis Ehrenb. In any case it cannot be accepted as a synonym for D. oblonga Ehrenb., and the safest course now is to discard the name protei- formis altogether. Examples are occasionally met with in which the test is in some degree compressed, and occasionally a want of bi-lat Stock Photo

RMPG1A64–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fias. 38 AND 39.—Difflugia oblonga : 38, common form incrusted with sand-grains, x 200 ; 39, a peculiar form from Clapham, W. Torks, chiefly incrusted with diatoms, x 310. The latter reduced from a drawing by G. S. West. name proteiformis Ehrenb. In any case it cannot be accepted as a synonym for D. oblonga Ehrenb., and the safest course now is to discard the name protei- formis altogether. Examples are occasionally met with in which the test is in some degree compressed, and occasionally a want of bi-lat

. General physiology; an outline of the science of life. 382 GENERAL PHYSIOLOGY nounced phenomena of contraction, according to the very various grades of irritability of the different species.^ An Amosba or an Adinosphcerium, stimulated in this way, ceases momentarily its centrifugal protoplasmic streaming, i.e., the extension of its pseudopodia; upon stronger stimulation there may be a partial indrawing of the pseudopodia, a transitory centripetal streaming. Other forms, such as Difflugia, react more energetically (Fig. 173). With a gentle shock the pseudopodia become slowly more or less retr Stock Photo

RMRE0FTM–. General physiology; an outline of the science of life. 382 GENERAL PHYSIOLOGY nounced phenomena of contraction, according to the very various grades of irritability of the different species.^ An Amosba or an Adinosphcerium, stimulated in this way, ceases momentarily its centrifugal protoplasmic streaming, i.e., the extension of its pseudopodia; upon stronger stimulation there may be a partial indrawing of the pseudopodia, a transitory centripetal streaming. Other forms, such as Difflugia, react more energetically (Fig. 173). With a gentle shock the pseudopodia become slowly more or less retr

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 44. Fiaa. 42-44.—Difflugia acuminata Ehrenb. showing great variation. X 200. Fig. 42.—From pond at Chipperfield, Herts. Fig. 43.— After Ehrenberg, loc. cit. (reduced). Fig. 44.—Var. acaulis Perty. After Perty, loc. cit. Bhrenb. Ehrenberg's name was given to the common large form, which has a nearly cylindrical test, slightly enlarged posteriorly, and is three to four times longer than broad, with an acute apex. Between this—which may be regarded as typical—and the smaller varieties, there is a large grada Stock Photo

RMPG1A5K–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 44. Fiaa. 42-44.—Difflugia acuminata Ehrenb. showing great variation. X 200. Fig. 42.—From pond at Chipperfield, Herts. Fig. 43.— After Ehrenberg, loc. cit. (reduced). Fig. 44.—Var. acaulis Perty. After Perty, loc. cit. Bhrenb. Ehrenberg's name was given to the common large form, which has a nearly cylindrical test, slightly enlarged posteriorly, and is three to four times longer than broad, with an acute apex. Between this—which may be regarded as typical—and the smaller varieties, there is a large grada

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVKMKNT AND RFSPOXSK IX DIFFLUGIA 233 then in another; movement which in comparison with that of normal specimens was very irregular in direction and quite uncoordinated. For some time after these specimens left the shells the pseudopods extended, attached and contracted, pulling the body along, much as they do in normal specimens. Sometimes two pseudopods appeared on op-. FIG. 5. Camera sketch of a specimen of Difflugia pyrifonnis two days after it had left its shell which had been broken by the pressure of the cover-glass Stock Photo

RMRHMTBB–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVKMKNT AND RFSPOXSK IX DIFFLUGIA 233 then in another; movement which in comparison with that of normal specimens was very irregular in direction and quite uncoordinated. For some time after these specimens left the shells the pseudopods extended, attached and contracted, pulling the body along, much as they do in normal specimens. Sometimes two pseudopods appeared on op-. FIG. 5. Camera sketch of a specimen of Difflugia pyrifonnis two days after it had left its shell which had been broken by the pressure of the cover-glass

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 87-89.—" Difflugia bipes " Carter : 87, broad view of test; 88, narrow view; 89, the living animal. The circle in fig. 87 shows the position of the animal when withdrawn into its test, x 250. Dimensions : Length about 140 jx; breadth 72 /a (; width of aperture 35 ^u.). Freshwater pool in heath-bog, living on minute algge (Oscillaria, etc.), progressing after the manner of Diffltogias generally, with the test vertical and the fundus uppermost; Budleigh-Salterton, Devon, 1869 (H. J. Garter). Stock Photo

RMPG19YY–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 87-89.—" Difflugia bipes " Carter : 87, broad view of test; 88, narrow view; 89, the living animal. The circle in fig. 87 shows the position of the animal when withdrawn into its test, x 250. Dimensions : Length about 140 jx; breadth 72 /a (; width of aperture 35 ^u.). Freshwater pool in heath-bog, living on minute algge (Oscillaria, etc.), progressing after the manner of Diffltogias generally, with the test vertical and the fundus uppermost; Budleigh-Salterton, Devon, 1869 (H. J. Garter).

. A critique of the theory of evolution. Evolution. THEORY or E'()LUTION 18.5 several nuclei and in addition there is scattered material or 2)articles called chromidia that are. Fig. 91. Difflugia Corona. (After Ca.sh.) supposed to be chromatic in nature and related to the material of the nuclei, j^ossibly by direct interchange. When Difflug'ia divides, part of the proto- plasm protrudes from the opening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence that th Stock Photo

RMRDP32K–. A critique of the theory of evolution. Evolution. THEORY or E'()LUTION 18.5 several nuclei and in addition there is scattered material or 2)articles called chromidia that are. Fig. 91. Difflugia Corona. (After Ca.sh.) supposed to be chromatic in nature and related to the material of the nuclei, j^ossibly by direct interchange. When Difflug'ia divides, part of the proto- plasm protrudes from the opening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence that th

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Pig. 99.—Nehela caudata. After Leidy^ loc. eit. (reduced to one-half), a, broad view of an empty test; 6 and c, broad views of two encysted individuals; d, narrow view of the latter, x 250. extremities ; in some cases curved. The test, in broad view, has convex sides, which descend evenly down to the truncated mouth, but in narrow lateral view a dis- tinct neck is shown, the test being strongly compressed, particularly in its lower half. [19. Nebela triangulata (Lang). (Fig. 99.) Difflugia triangulata Lan Stock Photo

RMPG19XD–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Pig. 99.—Nehela caudata. After Leidy^ loc. eit. (reduced to one-half), a, broad view of an empty test; 6 and c, broad views of two encysted individuals; d, narrow view of the latter, x 250. extremities ; in some cases curved. The test, in broad view, has convex sides, which descend evenly down to the truncated mouth, but in narrow lateral view a dis- tinct neck is shown, the test being strongly compressed, particularly in its lower half. [19. Nebela triangulata (Lang). (Fig. 99.) Difflugia triangulata Lan

RMRDBPE5–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 36 BEITISH FEESHWATER RHIZOPODA. figures with any known species of Difflugia. The D. glohulosa of modern authors is well known as having a globose or hemispherical test, with an oral aperture â â-comparatively largeâsituated not at the extremity of an ovoid body, but on the basal surface (in this case the ventral surface) of the hemisphereâa quite different arrangement. But if we cannot accept D. glob'idosa Duj. on account of its ambiguity, still less is it permissible to perpetuate a name which the autho

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. FiCiS. iG AT>iT> 47.—Difflugia hacillariarum. After Gr. S. West (as D. acuminata ya,T. elegans). Fig. 46 from Wioken Fen, Cambs. x 340. Fig-. 47 from Llyn-y-cwm-ffynon, N. Wales, x 520. from .the figures (we have had no opportunity of examining the actual tests), this and Penard's D. elegans var. teres (' Sarc. des grands Lacs' [1905] p. 16) seem to be identical. No example which could safely be referred to either of these forms has yet been met with in Britain. They would rank under this classifica Stock Photo

RMPG1A50–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. FiCiS. iG AT>iT> 47.—Difflugia hacillariarum. After Gr. S. West (as D. acuminata ya,T. elegans). Fig. 46 from Wioken Fen, Cambs. x 340. Fig-. 47 from Llyn-y-cwm-ffynon, N. Wales, x 520. from .the figures (we have had no opportunity of examining the actual tests), this and Penard's D. elegans var. teres (' Sarc. des grands Lacs' [1905] p. 16) seem to be identical. No example which could safely be referred to either of these forms has yet been met with in Britain. They would rank under this classifica

. Experimental morphology. Protoplasm; Growth. §2] EFFECT ON METABOLISM AND MOVEMENT 101 the thick region, together with all the proximal lying proto- plasm, begins to flow towards the centre. The whole plasma thread retracts. Again, if an individual of Difflugia (Fig. 15) be slightly- shaken, the pseudopodium contracts into the shell; if it be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davenport, Charles Benedict, 18 Stock Photo

RMRE0C8M–. Experimental morphology. Protoplasm; Growth. §2] EFFECT ON METABOLISM AND MOVEMENT 101 the thick region, together with all the proximal lying proto- plasm, begins to flow towards the centre. The whole plasma thread retracts. Again, if an individual of Difflugia (Fig. 15) be slightly- shaken, the pseudopodium contracts into the shell; if it be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davenport, Charles Benedict, 18

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 'd^ Figs. 58 and 59.—Oral views of Difflugia lolostoma showing great variation in size: 58, from Carlton Banks, N. Torks, x 520; 59, from Sedburgli, W. Torks, x 100. From drawings by G. S. West. from more recent investigations, for separating some of the forms. D. gram.en Penard, and others, differ from D. loho- stoma, in having tests which are overlaid with coarse sand-grains, giving them a rough exterior, Avhilst D. lobostoma is comparatively smooth, its lobed mouth beautifully cut, and the entire struc Stock Photo

RMPG1A3N–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 'd^ Figs. 58 and 59.—Oral views of Difflugia lolostoma showing great variation in size: 58, from Carlton Banks, N. Torks, x 520; 59, from Sedburgli, W. Torks, x 100. From drawings by G. S. West. from more recent investigations, for separating some of the forms. D. gram.en Penard, and others, differ from D. loho- stoma, in having tests which are overlaid with coarse sand-grains, giving them a rough exterior, Avhilst D. lobostoma is comparatively smooth, its lobed mouth beautifully cut, and the entire struc

. The biology of the protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF THE SARCODINA 457 ment. In Chlamydophrys they form a network as in Allogromia (Fig. 189). The tests are simple, one-chambered structures of widely-varied form, frequently ornamented with spines and processes. The basis of all shells is a pseudochitinous membrane which, in some forms, is greatly thickened and constitutes the test; in other cases foreign particles are cemented to the outside of the chitinous membrane (Difflugia, Centropyxis, etc.), and in still other cases silicious plates are precipitated in the endop Stock Photo

RMRHK071–. The biology of the protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF THE SARCODINA 457 ment. In Chlamydophrys they form a network as in Allogromia (Fig. 189). The tests are simple, one-chambered structures of widely-varied form, frequently ornamented with spines and processes. The basis of all shells is a pseudochitinous membrane which, in some forms, is greatly thickened and constitutes the test; in other cases foreign particles are cemented to the outside of the chitinous membrane (Difflugia, Centropyxis, etc.), and in still other cases silicious plates are precipitated in the endop

. Das Süsswasser-Aquarium : Geschichte, Flora und Fauna des Süsswasser-Aquariums, seine Anlage und Pflege. Aquariums; Freshwater biology; Freshwater animals; Freshwater plants. A-tciur 179. gIot)freb§ (Daphnia pulex). Start bergtöfjert.. Bftgur iso. 1. Opercularia nutans. '2. Halteria gran- dinella. 3. Carchesium polypinum. 4. Aci- neta mystacina. 5. Astylozoon fallax. 6. Epistylis plicatilis. 7. Podophrya qua- dripartita. (Stark vergr.) Juv 181. J. Codosiga botrytis. 2. Difflugia tirceolata. :;. Pseudochlamys patella. 1. Aniöba proteus aut. 5. Hyalodiscus guttula. fi. Stichotricha. seeimd Stock Photo

RMPFG4JN–. Das Süsswasser-Aquarium : Geschichte, Flora und Fauna des Süsswasser-Aquariums, seine Anlage und Pflege. Aquariums; Freshwater biology; Freshwater animals; Freshwater plants. A-tciur 179. gIot)freb§ (Daphnia pulex). Start bergtöfjert.. Bftgur iso. 1. Opercularia nutans. '2. Halteria gran- dinella. 3. Carchesium polypinum. 4. Aci- neta mystacina. 5. Astylozoon fallax. 6. Epistylis plicatilis. 7. Podophrya qua- dripartita. (Stark vergr.) Juv 181. J. Codosiga botrytis. 2. Difflugia tirceolata. :;. Pseudochlamys patella. 1. Aniöba proteus aut. 5. Hyalodiscus guttula. fi. Stichotricha. seeimd

. Protozoo?logy. Protozoa; Protozoa, Pathogenic. PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA 93 forms like arcella, difflugia, or euglypha, where the cell is enclosed in a test or shell. Here the protoplasm wells out of the mouth opening of the shell until it forms a counterpart of the parent organism, then the nucleus divides, as stated, and the two individuals separate. Such a method is complicated, and to a certain extent anticipated, by the organism, for long before the cell divides the shell plates of a euglypha are formed and stored up in the protoplasm about the nucleus of the parent organ Stock Photo

RMRDXBWM–. Protozoo?logy. Protozoa; Protozoa, Pathogenic. PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA 93 forms like arcella, difflugia, or euglypha, where the cell is enclosed in a test or shell. Here the protoplasm wells out of the mouth opening of the shell until it forms a counterpart of the parent organism, then the nucleus divides, as stated, and the two individuals separate. Such a method is complicated, and to a certain extent anticipated, by the organism, for long before the cell divides the shell plates of a euglypha are formed and stored up in the protoplasm about the nucleus of the parent organ

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 52-54.—Difflugia globulus: 52, after Ehrenberg, loc. cit. 1856 (enlarged) ; 53, from Cocket Moss, W. Torks, drawn by G. S. West (reduced); 54, after Wallich, loc. cit. i. 2a (enlarged). Variously magnified. Leidy joins several forms, now recognized as dis- tinct, under the name of " D. globulosa Duj."—connect- ing it with " D. pyriformia Perty " (D. oblonga Ehrenb.) on the one hand, and with D. lobostoma Leidy, on the other. A new genus, PhryganeUa, was established by Penard (' M Stock Photo

RMPG1A47–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 52-54.—Difflugia globulus: 52, after Ehrenberg, loc. cit. 1856 (enlarged) ; 53, from Cocket Moss, W. Torks, drawn by G. S. West (reduced); 54, after Wallich, loc. cit. i. 2a (enlarged). Variously magnified. Leidy joins several forms, now recognized as dis- tinct, under the name of " D. globulosa Duj."—connect- ing it with " D. pyriformia Perty " (D. oblonga Ehrenb.) on the one hand, and with D. lobostoma Leidy, on the other. A new genus, PhryganeUa, was established by Penard (' M

RMRDBPJY–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. a BKITISH FRESHWATER EHIZOPODA. Althougli this species is now almost universally called Diffliigia pyriformis, Ehrenberg's name has the priority and must be adopted in accordance with the rules of zoological nomenclature. "While there can moreover be no question as to the species being Ehrenberg's Difflugia oblonga, its identity with the pyriformis of Perty admits of doubt; indeed from its smooth outline, slender neck, and nearly regular mark- ings, Perty's figure may represent a Nebela. [From the de

. Fresh-water biology. Freshwater biology. 2 24 FRESH-WATER BIOLOGY 59 (72) 60 (61) Shell without internal partition or diaphragm. Difflugia Leclerc 60 Aperture not central. Difflugia constricta Ehrenberg 1841. Fig. 300. X no. 61 (60) 62 (69) 63 (66) 64 (6S) Shells of various forms from nearly spherical to oval and elon- gate. Aperture always eccentric. Pseudopodium single, rarely observed. Spines sometimes developed from the fundus. This species is closely related to Centropyxis aculeata. A common species, widely distributed. Large forms may reach 200 n in Difflugia constricta. length. Most i Stock Photo

RMPFYKGP–. Fresh-water biology. Freshwater biology. 2 24 FRESH-WATER BIOLOGY 59 (72) 60 (61) Shell without internal partition or diaphragm. Difflugia Leclerc 60 Aperture not central. Difflugia constricta Ehrenberg 1841. Fig. 300. X no. 61 (60) 62 (69) 63 (66) 64 (6S) Shells of various forms from nearly spherical to oval and elon- gate. Aperture always eccentric. Pseudopodium single, rarely observed. Spines sometimes developed from the fundus. This species is closely related to Centropyxis aculeata. A common species, widely distributed. Large forms may reach 200 n in Difflugia constricta. length. Most i

. A critique of the theory of evolution. Evolution. THEORY OF EVOLUTION 185 several nuclei and in addition there is scattered material or particles called chromidia that are. Fig. 91. Ditflugi (After Cash.) sujDposed to be chi-oniatic in nature and related to the material of the nuclei, jJ^ssibly by direct interchange. Anien Difflugia divides, part of the proto- plasm i^rotrudes from the oj^ening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence that their mate Stock Photo

RMRE5B9R–. A critique of the theory of evolution. Evolution. THEORY OF EVOLUTION 185 several nuclei and in addition there is scattered material or particles called chromidia that are. Fig. 91. Ditflugi (After Cash.) sujDposed to be chi-oniatic in nature and related to the material of the nuclei, jJ^ssibly by direct interchange. Anien Difflugia divides, part of the proto- plasm i^rotrudes from the oj^ening and a new shell is secreted about this mass which becomes a daughter individual. The behavior of the nucleus and of the chromidia at this time is ob- scure, but there is some evidence that their mate

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. PONTIGTJLASIA ELISA. 161 [(p. 64) 4. Pontigulasia elisa (Penard) Schouteden. (Figs. 107-109.) Difflugia elisa Penaed in Arch. Sci. nat. (3) XXIX (1893), p. 177, t. iii, f. 7. Pontigulasia incisa Rhumbler in Zeits. wiss. Zool. LXI, 1 (1895), p. 105, t. iv, ff. 5, 22-25; Penaed Faune Ehiz. Leman (1902), p. 315, ff. 1-6; Aveeintzev in Trudui S.-Peterb. Obslich. XXXVI (1906), 2, p. 169. Pontigulasia elisa Schoutbdbn in Ann. Biol. Lacustre I, 3 (1906), p. 345 (note). 107 108. 109 Figs. 107-109.—Pontigulasia el Stock Photo

RMPG19W2–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. PONTIGTJLASIA ELISA. 161 [(p. 64) 4. Pontigulasia elisa (Penard) Schouteden. (Figs. 107-109.) Difflugia elisa Penaed in Arch. Sci. nat. (3) XXIX (1893), p. 177, t. iii, f. 7. Pontigulasia incisa Rhumbler in Zeits. wiss. Zool. LXI, 1 (1895), p. 105, t. iv, ff. 5, 22-25; Penaed Faune Ehiz. Leman (1902), p. 315, ff. 1-6; Aveeintzev in Trudui S.-Peterb. Obslich. XXXVI (1906), 2, p. 169. Pontigulasia elisa Schoutbdbn in Ann. Biol. Lacustre I, 3 (1906), p. 345 (note). 107 108. 109 Figs. 107-109.—Pontigulasia el

. A critique of the theory of evolution. Evolution. 186 THEORY OF EVOLUTION tween parent and offspring. If this is correct, and if in the protozoa the chromatin has the same influence that it seems to have in higher animals, the mode of reproduction in Difflugia would l)e expected to give little more than ran- dom samjiling of the germ plasm. Jennings was able by means of selection to get from the descendants of one original indi-. FiG. 92. Races of Difflugia. (After Leidy.) vidual a number of difi^erent types that them- selves bred true, except in so far as selection could affect another chan Stock Photo

RMRE5B9M–. A critique of the theory of evolution. Evolution. 186 THEORY OF EVOLUTION tween parent and offspring. If this is correct, and if in the protozoa the chromatin has the same influence that it seems to have in higher animals, the mode of reproduction in Difflugia would l)e expected to give little more than ran- dom samjiling of the germ plasm. Jennings was able by means of selection to get from the descendants of one original indi-. FiG. 92. Races of Difflugia. (After Leidy.) vidual a number of difi^erent types that them- selves bred true, except in so far as selection could affect another chan

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 92. â liJffSS^W Fig. 91.âTest oi Nehela tincta. Dunham, Cheshire, x 280. Fig. 92.â" Difflugia proteiformis " Party: ? = test of Nehela tincta. After Perty, loc. cit. x 300. 3. Nebela lageniformis Penard. (Plate XXV, figs. 12-14.) Nehehi sp. Leidy Freshw. Rhiz. N. Amer. (1879), p. 160, t. xxiv, ff. 18, 19. Ni'hi'lft lageniformis Penaed in Mem. Soc. Geneve, XXXI (1890), 2, p. 158, t. vi, ff. 50-61 ; in Jahrb. nassau. Ver. Naturk. XLIII (1890), p. 71; Faune Rhiz. Leman (1902), ]). 355, ff. 1-4 (p. Stock Photo

RMPG19YE–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 92. â liJffSS^W Fig. 91.âTest oi Nehela tincta. Dunham, Cheshire, x 280. Fig. 92.â" Difflugia proteiformis " Party: ? = test of Nehela tincta. After Perty, loc. cit. x 300. 3. Nebela lageniformis Penard. (Plate XXV, figs. 12-14.) Nehehi sp. Leidy Freshw. Rhiz. N. Amer. (1879), p. 160, t. xxiv, ff. 18, 19. Ni'hi'lft lageniformis Penaed in Mem. Soc. Geneve, XXXI (1890), 2, p. 158, t. vi, ff. 50-61 ; in Jahrb. nassau. Ver. Naturk. XLIII (1890), p. 71; Faune Rhiz. Leman (1902), ]). 355, ff. 1-4 (p.

. The microscope; a simple handbook. Microscopes. THE MICROSCOPE AS A RECREATION 127. Fig. 115.—Difflugia. somewhat darker and harder material, is always present and is essential to life. What part it plays is unknown; it appears to be a kind of vital spark, and is called the Nucleus. The other organ is nothing more or less than a good-sized bubble, called the Vacuole. The Amoeba, the simplest form of animal that exists, is so colour- less and so transparent that every- thing going on in its interior is visible. Its structure can be imderstood at a glance, and start- ing from this simple form Stock Photo

RMRDRXTG–. The microscope; a simple handbook. Microscopes. THE MICROSCOPE AS A RECREATION 127. Fig. 115.—Difflugia. somewhat darker and harder material, is always present and is essential to life. What part it plays is unknown; it appears to be a kind of vital spark, and is called the Nucleus. The other organ is nothing more or less than a good-sized bubble, called the Vacuole. The Amoeba, the simplest form of animal that exists, is so colour- less and so transparent that every- thing going on in its interior is visible. Its structure can be imderstood at a glance, and start- ing from this simple form

. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA CORONA. 51 ScHOUTEDEN in Aiiii. Biol. Lacusti-e, I, 3 (1906), pp. 344, 348, f. 21; ZscHOKKE in Arch. Hydrobiol. II, 1 (1906), p. 3; Lemmermann in Arch. Hydrobiol. II, 4 (1907), p. 537; Skoeikov in Bull. Acad. Sci. St. Petersb. (6) I (1907), pp. 124, 125, etc.; Hoogeneaad in Tydschr. Nederl. Dierk. Ver. (2) X, 4 (1908), p. 407 ; Landacbe in Pr. Davonport Acad. Sci. IV, 10 (1908), p. 428. Corona cornida Vejdovsky in Sitzber..b6hm. Ges. Wiss. 1880 (1881), p. 137. Diffliogia acuminata var. furcata D Stock Photo

RMPG1A2P–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFFLUGIA CORONA. 51 ScHOUTEDEN in Aiiii. Biol. Lacusti-e, I, 3 (1906), pp. 344, 348, f. 21; ZscHOKKE in Arch. Hydrobiol. II, 1 (1906), p. 3; Lemmermann in Arch. Hydrobiol. II, 4 (1907), p. 537; Skoeikov in Bull. Acad. Sci. St. Petersb. (6) I (1907), pp. 124, 125, etc.; Hoogeneaad in Tydschr. Nederl. Dierk. Ver. (2) X, 4 (1908), p. 407 ; Landacbe in Pr. Davonport Acad. Sci. IV, 10 (1908), p. 428. Corona cornida Vejdovsky in Sitzber..b6hm. Ges. Wiss. 1880 (1881), p. 137. Diffliogia acuminata var. furcata D

. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 345 mclla) or the slime by which the animals adhere to the substratum {Amajba, Difflugia, Folystomclla). Beside these results should be placed the well-known fact that dissevered nerve-fibres in the higher animals are only regenerated from that end which remains in con- nection with the nerve-cell, while the remaining portion invariably degenerates. il k A. Kzy C D Fig. i6i. — Formation of membranes by protoplasmic fragments of plasmolyzed cells. [TowN- SEND.] A. Plasmolyzed cell, leaf-hair of Stock Photo

RMRJBBX4–. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 345 mclla) or the slime by which the animals adhere to the substratum {Amajba, Difflugia, Folystomclla). Beside these results should be placed the well-known fact that dissevered nerve-fibres in the higher animals are only regenerated from that end which remains in con- nection with the nerve-cell, while the remaining portion invariably degenerates. il k A. Kzy C D Fig. i6i. — Formation of membranes by protoplasmic fragments of plasmolyzed cells. [TowN- SEND.] A. Plasmolyzed cell, leaf-hair of

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENT AND RESPONSE IN DIFFLUGIA 231 III. FIG. 4. A series of camera sketches of a pseudopod of Diffluyia pyriformis representing different stages in the process of contraction in a specimen with the shell fastened to the substratum. A, early stage in the attachment of the pseudopod to the substratum; B, pseudopod firmly attached at the tip and beginning to contract elsewhere. Note that the plasmagel has increased in thickness and that it appears to be fibrous at the tip. C, D, and E, stages in the contraction of the pseud Stock Photo

RMRHMTC8–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENT AND RESPONSE IN DIFFLUGIA 231 III. FIG. 4. A series of camera sketches of a pseudopod of Diffluyia pyriformis representing different stages in the process of contraction in a specimen with the shell fastened to the substratum. A, early stage in the attachment of the pseudopod to the substratum; B, pseudopod firmly attached at the tip and beginning to contract elsewhere. Note that the plasmagel has increased in thickness and that it appears to be fibrous at the tip. C, D, and E, stages in the contraction of the pseud

RMRDBP6Y–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Figs. 105 and 106.— Difflugia tuherculata : 105, lateral view; 106, oral view. Outlines derived from Wallioh's and Penard's figures, x 200. As in the case of several other rhizopods which Archer found in Ireland and exhibited before the Dublin Microscopical Club, he omitted to give the locality. That the species does occur in Ireland has recently been confirmed by Dr. Penard. Wallich described Difflugia tuherculata, as of varietal rank only, in the-'Annals of Natural History' for March, 1867, without givi

. The cell in development and inheritance. Cells. B C Fig. 112. — Regeneration in the unicellular animal Stentor. [Gkl'BER.] A. Animal divided into three pieces, each containing a fragment of the nucleus. B. The three fragments shortly afterwards. C. The three fragments after twenty-four hours, each regen- erated to a perfect animal. altered, but are never completely digested. The non-nucleated frag- ments are unable to secrete the material for a new shell {Polysto- mella) or the slime by which the animals adhere to the substratum {Ainccba, Difflugia, Polystoniclla). Beside these results shoul Stock Photo

RMRJBCCN–. The cell in development and inheritance. Cells. B C Fig. 112. — Regeneration in the unicellular animal Stentor. [Gkl'BER.] A. Animal divided into three pieces, each containing a fragment of the nucleus. B. The three fragments shortly afterwards. C. The three fragments after twenty-four hours, each regen- erated to a perfect animal. altered, but are never completely digested. The non-nucleated frag- ments are unable to secrete the material for a new shell {Polysto- mella) or the slime by which the animals adhere to the substratum {Ainccba, Difflugia, Polystoniclla). Beside these results shoul

. Contributions to the fauna of the New York Croton water : microscopial observations during the years 1870-'71. Water-supply; Water. microscope. (500—700 diameters.) The figure XII, on the third plate, represents the species Difflugia, found in the sediment of the Croton water. Another animalcule similar to an amcebial form, is the Actit^ophrys, re- markable for the long, tentacle-like, so-called " Pseudo- podia," with which its globular body is surrounded, and which has not been fully represented on the wood-cut on account of want of space. I observed this interesting crea- ture wi Stock Photo

RMRE9GD8–. Contributions to the fauna of the New York Croton water : microscopial observations during the years 1870-'71. Water-supply; Water. microscope. (500—700 diameters.) The figure XII, on the third plate, represents the species Difflugia, found in the sediment of the Croton water. Another animalcule similar to an amcebial form, is the Actit^ophrys, re- markable for the long, tentacle-like, so-called " Pseudo- podia," with which its globular body is surrounded, and which has not been fully represented on the wood-cut on account of want of space. I observed this interesting crea- ture wi

. A critique of the theory of evolution. Evolution; Evolution. 186 THEORY OF EVOLUTION tween parent and offspring. If this is correct, and if in the protozoa the chromatin has the same influence that it seems to have in higher animals, the mode of reproduction in Difflugia would be expected to give little more than ran- dom sampling of the germ plasm. Jennings was able by means of selection to get from the descendants of one original indi-. Fig. 92. Races of Difflugia. (After Leidy.) vidual a number of different types that them- selves bred true, except in so far as selection could affect anot Stock Photo

RMRE5B9T–. A critique of the theory of evolution. Evolution; Evolution. 186 THEORY OF EVOLUTION tween parent and offspring. If this is correct, and if in the protozoa the chromatin has the same influence that it seems to have in higher animals, the mode of reproduction in Difflugia would be expected to give little more than ran- dom sampling of the germ plasm. Jennings was able by means of selection to get from the descendants of one original indi-. Fig. 92. Races of Difflugia. (After Leidy.) vidual a number of different types that them- selves bred true, except in so far as selection could affect anot

RMRDE25W–. Fresh-water rhizopods of North America. Rhizopoda; Freshwater animals. GENUS NEBELA—NEBELA COLLAEIS. 151 In all other respects, the forms agree with the varieties of N. collaris, hut I have never met with specimens in which the shell was otherwise than com- pressed. Mr. Carter, in the same work, described a form under the name of Difflugia peltigeracea, which probably also belongs to the same animal as Nebela collaris. The nature of the singularly varied shell of Nebela collaris I have not been able to determine with any satisfaction. In the characteristic forms, the elements of structure, t

. Annales de la Société royale zoologique et malacologique de Belgique. Zoology; Mollusks. Fig. 12. — Difflugia arceolata, page 30. — Les bâtonnets transversalement striés dans la coquille supérieure droite i ml des carapaci s de diatomées.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société royale zoologique et malacologique de Belgique. [S. l. : s. n. ] Stock Photo

RMRN2A2F–. Annales de la Société royale zoologique et malacologique de Belgique. Zoology; Mollusks. Fig. 12. — Difflugia arceolata, page 30. — Les bâtonnets transversalement striés dans la coquille supérieure droite i ml des carapaci s de diatomées.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société royale zoologique et malacologique de Belgique. [S. l. : s. n. ]

. The biology of the Protozoa. Protozoa; Protozoa. 130 BIOLOGY OF THE PROTOZOA of silica are deposited in the inner protoplasm and passed out during reproduction to be cemented on the chitinous membrane in regular patterns (Euglypha alreolata. Fig. S, p. 30). Foreign bodies caught up in the wrinkles of withdrawing pseudopodia are similarly stored in the protoplasm to be used for shell-building purposes, Verworn, for example, compelling Difflugia to build its shell of difl'erent kinds of powdered glass. The lime shells of Foraminifera are formed in quite a different manner. Here, calcium carbon Stock Photo

RMRHK3FD–. The biology of the Protozoa. Protozoa; Protozoa. 130 BIOLOGY OF THE PROTOZOA of silica are deposited in the inner protoplasm and passed out during reproduction to be cemented on the chitinous membrane in regular patterns (Euglypha alreolata. Fig. S, p. 30). Foreign bodies caught up in the wrinkles of withdrawing pseudopodia are similarly stored in the protoplasm to be used for shell-building purposes, Verworn, for example, compelling Difflugia to build its shell of difl'erent kinds of powdered glass. The lime shells of Foraminifera are formed in quite a different manner. Here, calcium carbon

RMRDBPBY–. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. Fi«. 60.—Difflugia proteiformis Ehrenb. Three aspects of the same individual. ? = D. lobostoma. After Ehrenberg, ' Infns.' t. ix. f. 1 a-c (reduced), x 200. In our remarks on D: ohlonga, Ehrenb. reference is made to the uncertainty regarding the particular organism^ to which Ehrenberg apphed the name D. proteiformis. There is more probability of the author having had before him examples of D. lobostoma —judging from his figures—than any other rhizopod. 61. Please note that these images are extracted from

Difflugia Stock Photos and Images

Difflugia Stock Photos and Images

Download Confirmation

Password Confirmation

Search Results for Difflugia Stock Photos and Images (176)

Filter by agency collections

Search builder

Get great features with your free account

Get inspired for your next project!