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RMRHP7HF–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. . 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. y^' rsv^>' :x^JjS?'':'- -^ D "M op.L. ^â/>⢠'^-'^^ I. B ft. :i,' ^oLK Isl/}^ Cscr Pa/: - ?â ' 'C/elmed.) y/ â ^-//J/p.. 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. New York : Henry Holt Stock Photo](https://c8.alamy.com/comp/PFA7JF/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-y-rsvgt-xjjs-d-quotm-opl-gt-i-b-ft-i-olk-isl-cscr-pa-celmed-y-jp-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-new-york-henry-holt-PFA7JF.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. y^' rsv^>' :x^JjS?'':'- -^ D "M op.L. ^â/>⢠'^-'^^ I. B ft. :i,' ^oLK Isl/}^ Cscr Pa/: - ?â ' 'C/elmed.) y/ â ^-//J/p.. 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. New York : Henry Holt Stock Photo")
RMPFA7JF–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. y^' rsv^>' :x^JjS?'':'- -^ D "M op.L. ^â/>⢠'^-'^^ I. B ft. :i,' ^oLK Isl/}^ Cscr Pa/: - ?â ' 'C/elmed.) y/ â ^-//J/p.. 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. New York : Henry Holt
RMRHMRH5–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEVELOPMENT OF BOTRYLLUS BUD 181 elude other cells from the first. No stage, with the possible exception of those shown in Fig. 3, has been seen in which the ova proper are without accessory cells. These cells are of two kinds, a few flattened follicle cells clinging to the surface, and an equally small number of nurse cells completely within the cytoplasm of the ovum. Following multiplication, the outer surface cells become columnar, as in Fig. 6, D, and eventually flatten again as they give rise to the egg chorion. The nur
RMPFA7B1–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE BODY-CAVITIES 335 the heart and liver, (5) a median portion comprising the sinus venosus, ductus venosus and Uver, and (c) an inferior portion. The superior part persists in the region of the sinus venosus and Uver, and the inferior part only as the primary ventral ligament of the liver. The median mass of the septum transversum thus includes the sinus venosus, liver, and dorsal and ventral ligaments of the liver. At sixty hours the median mass includes chiefly the sinus and ductus venosus and
RMRHNT7M–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 490 P. MORRISON shows a value 40 minutes after stopping activity which has returned to the level of quiet, awake animals. These changes in body temperature may be used to estimate heat production during warming. Thus, a maximum increase of 1.03°/min. (11.5-^23.8° in 12 minutes) was observed in one individual. This is equivalent to 0.85 cal. g.-1min.1 or an oxygen consumption of 10.7 cc. g.1hrr1 (other cases (24.6^32.2° in 10. FIGURE 6. Body temperature in Pteropus after exposure at various ambient temperatures. Values indi
RMPF9MJ0–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 24 THE DEVELOPMENT OF THE CHICK 17/ of the oviduct. The escape of the ovum from the foUicle is known as the process of ovulation. During its passage down the ovi- duct it becomes surrounded by layers of albumen secreted by the oviducal glands. The shell- membrane is secreted in the isthmus and the shell in the uterus (Fig. 5). The ovum is fertilized in the uppermost part of the oviduct and the cleavage and early stages of formation of the germ-layers take place be- fore the egg is laid. The time oc
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. r = 09472 L 10 20 30 40 50 60 Carapace breadth (mm) J O O 6 E o -c 150 100 50- (b). 10 20 30 40 50 60 Carapace breadth (mm) I50r o 90 . 0) Q. 60 -Q § 3° 4) (c] lo r = 09684. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lill Stock Photo](https://c8.alamy.com/comp/RHKRHW/the-biological-bulletin-biology-zoology-biology-marine-biology-r-=-09472-l-10-20-30-40-50-60-carapace-breadth-mm-j-o-o-6-e-o-c-150-100-50-b-10-20-30-40-50-60-carapace-breadth-mm-i50r-o-90-0-q-60-q-3-4-c-lo-r-=-09684-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-marine-biological-laboratory-woods-hole-mass-marine-biological-laboratory-woods-hole-mass-annual-report-190708-1952-lill-RHKRHW.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. r = 09472 L 10 20 30 40 50 60 Carapace breadth (mm) J O O 6 E o -c 150 100 50- (b). 10 20 30 40 50 60 Carapace breadth (mm) I50r o 90 . 0) Q. 60 -Q § 3° 4) (c] lo r = 09684. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lill Stock Photo")
RMRHKRHW–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. r = 09472 L 10 20 30 40 50 60 Carapace breadth (mm) J O O 6 E o -c 150 100 50- (b). 10 20 30 40 50 60 Carapace breadth (mm) I50r o 90 . 0) Q. 60 -Q § 3° 4) (c] lo r = 09684. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lill
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 2 7" i5r 1. -.2 â iM Fig. 19. â Transverse section of the blastoderm of a pigeon's egg about 8| hours after fertihzation (4.45 a.m.). (After Blount.) 1, Accessory cleavage. 2, Migrating sperm-nuclei, a, b, c, d, Cells of primary cleavage. the periblast is absolutely devoid of nuclei. Fragmentation of the sperm-nuclei is a frequent accompaniment of their disappearance. Thus the accessory cleavage is a secondary and transient feature of the cleavage of the pigeon's egg due to polyspermy. After i Stock Photo](https://c8.alamy.com/comp/PFA8G6/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-2-7quot-i5r-1-2-im-fig-19-transverse-section-of-the-blastoderm-of-a-pigeons-egg-about-8-hours-after-fertihzation-445-am-after-blount-1-accessory-cleavage-2-migrating-sperm-nuclei-a-b-c-d-cells-of-primary-cleavage-the-periblast-is-absolutely-devoid-of-nuclei-fragmentation-of-the-sperm-nuclei-is-a-frequent-accompaniment-of-their-disappearance-thus-the-accessory-cleavage-is-a-secondary-and-transient-feature-of-the-cleavage-of-the-pigeons-egg-due-to-polyspermy-after-i-PFA8G6.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 2 7" i5r 1. -.2 â iM Fig. 19. â Transverse section of the blastoderm of a pigeon's egg about 8| hours after fertihzation (4.45 a.m.). (After Blount.) 1, Accessory cleavage. 2, Migrating sperm-nuclei, a, b, c, d, Cells of primary cleavage. the periblast is absolutely devoid of nuclei. Fragmentation of the sperm-nuclei is a frequent accompaniment of their disappearance. Thus the accessory cleavage is a secondary and transient feature of the cleavage of the pigeon's egg due to polyspermy. After i Stock Photo")
RMPFA8G6–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 2 7" i5r 1. -.2 â iM Fig. 19. â Transverse section of the blastoderm of a pigeon's egg about 8| hours after fertihzation (4.45 a.m.). (After Blount.) 1, Accessory cleavage. 2, Migrating sperm-nuclei, a, b, c, d, Cells of primary cleavage. the periblast is absolutely devoid of nuclei. Fragmentation of the sperm-nuclei is a frequent accompaniment of their disappearance. Thus the accessory cleavage is a secondary and transient feature of the cleavage of the pigeon's egg due to polyspermy. After i
RMRHRA1W–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. to. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
RMPFA817–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 168 THE DEVELOPMENT OF THE CHICK less during this period, and are destined to form the epitheUum of the lens (Fig. 97). Intermediate conditions are found around the equator of the lens. The subsequent history is given in chapter IX. The Auditory Sac. At about the 12 s stage the first evidence of the auditory sacs is found in the form of a pair of circular patches of thickened ectoderm situated on the dorsal surface of the head opposite to the ninth, tenth, and eleventh neuromeres, and thus a short
RMRHPD85–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 248 GEORGE T. HARGITT. number of irregular cavities. This suggests the possibility of these cavities enlarging and running together, the cells at the same time taking up a regular position next the supporting layer, and thus the cavity of the bud being formed. In neither case, however, would the process necessarily begin at the proximal end. Furthermore, it is not quite certain just how the cavity at the distal end of the bud forms, or why it should form so early and not involve the proximal portion of the bud. In regard to
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Kojn.^. ^.^ ,VA rr.ir V /, ^ K -kr.8. f I /.o.rj. y.i/. o f- Fig. 210. — Diagrams illustrating the development of the hepatic portal circulation. (After Hochstetter.) A. About the fifty-eighth hour. • r j B. About the sixty-fifth hour; first venous rmg formed around the intestine. , , -, ,. , ^ ,, c + ,,^ C. About the seventy-fifth hour; the left limb of the hrst e- nous ring has disappeared. "^ . D. About the eightieth hour; the second venous rmg is estab- ^^ E." About the one hund Stock Photo](https://c8.alamy.com/comp/PFA77A/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-kojn-va-rrir-v-k-kr8-f-i-orj-yi-o-f-fig-210-diagrams-illustrating-the-development-of-the-hepatic-portal-circulation-after-hochstetter-a-about-the-fifty-eighth-hour-r-j-b-about-the-sixty-fifth-hour-first-venous-rmg-formed-around-the-intestine-c-c-about-the-seventy-fifth-hour-the-left-limb-of-the-hrst-e-nous-ring-has-disappeared-quot-d-about-the-eightieth-hour-the-second-venous-rmg-is-estab-equot-about-the-one-hund-PFA77A.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Kojn.^. ^.^ ,VA rr.ir V /, ^ K -kr.8. f I /.o.rj. y.i/. o f- Fig. 210. — Diagrams illustrating the development of the hepatic portal circulation. (After Hochstetter.) A. About the fifty-eighth hour. • r j B. About the sixty-fifth hour; first venous rmg formed around the intestine. , , -, ,. , ^ ,, c + ,,^ C. About the seventy-fifth hour; the left limb of the hrst e- nous ring has disappeared. "^ . D. About the eightieth hour; the second venous rmg is estab- ^^ E." About the one hund Stock Photo")
RMPFA77A–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Kojn.^. ^.^ ,VA rr.ir V /, ^ K -kr.8. f I /.o.rj. y.i/. o f- Fig. 210. — Diagrams illustrating the development of the hepatic portal circulation. (After Hochstetter.) A. About the fifty-eighth hour. • r j B. About the sixty-fifth hour; first venous rmg formed around the intestine. , , -, ,. , ^ ,, c + ,,^ C. About the seventy-fifth hour; the left limb of the hrst e- nous ring has disappeared. "^ . D. About the eightieth hour; the second venous rmg is estab- ^^ E." About the one hund
RMRHNXJM–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 MARIE M. JENKINS. 68 II 14 17 TIME IN DAYS 20 23 FIGURE 2. Growth rate curve of planarians exposed to 0.02% thiouracil (TL) and of those returned to water at the end of seven days (TL-W) compared with the characteristic curve of water controls (W). concentration of the chemicals revealed that, at this concentration, thiouracil was least effective in retarding growth, while phenylthiourea was most effective. A marked depression, approaching toxicity, followed continued exposure to both thio- urea and phenylthiourea, but a
RMPFA7CC–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 316 THE DEVELOPMENT OF THE CHICK cloacal membrane, is the neck of the allantois, and dorsal to this, the large intestine. Though not shown in the figure, it may be noted that the Wolffian ducts open into the cloaca behind and dorsal to the opening of the rectum. The appearance of the cloaca in a longitudinal section does not, however, give an adequate idea of its form. The anterior portion of the cloaca which receives the rectum, stalk of the allantois and Wolffian ducts is expanded considerably in
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 140 FERNANDUS PAYNE. division is impossible to say. All the chromosomes divide equally so that each secondary spermatocyte receives 20 chromosomes. No reconstruction period follows. (Fig. 8 and 9 are the same as in the preliminary paper, but Fig. 7 is new with the exception of A.) My former description of the second division seems adequate, and as I have nothing new to add, I will quote it as there described. £* *m ^••> •••„ /«*t • ^90 + % *r<b / *A % * / s *": **« ^ •« •••••• CA -x^iP^ vAi/,;x.. • • /m^ «••*. * Stock Photo](https://c8.alamy.com/comp/RHR9C8/the-biological-bulletin-biology-zoology-biology-marine-biology-140-fernandus-payne-division-is-impossible-to-say-all-the-chromosomes-divide-equally-so-that-each-secondary-spermatocyte-receives-20-chromosomes-no-reconstruction-period-follows-fig-8-and-9-are-the-same-as-in-the-preliminary-paper-but-fig-7-is-new-with-the-exception-of-a-my-former-description-of-the-second-division-seems-adequate-and-as-i-have-nothing-new-to-add-i-will-quote-it-as-there-described-m-gt-t-90-rltb-a-s-quot-ca-xip-vaix-m-RHR9C8.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 140 FERNANDUS PAYNE. division is impossible to say. All the chromosomes divide equally so that each secondary spermatocyte receives 20 chromosomes. No reconstruction period follows. (Fig. 8 and 9 are the same as in the preliminary paper, but Fig. 7 is new with the exception of A.) My former description of the second division seems adequate, and as I have nothing new to add, I will quote it as there described. £* *m ^••> •••„ /«*t • ^90 + % *r<b / *A % * / s *": **« ^ •« •••••• CA -x^iP^ vAi/,;x.. • • /m^ «••*. * Stock Photo")
RMRHR9C8–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 140 FERNANDUS PAYNE. division is impossible to say. All the chromosomes divide equally so that each secondary spermatocyte receives 20 chromosomes. No reconstruction period follows. (Fig. 8 and 9 are the same as in the preliminary paper, but Fig. 7 is new with the exception of A.) My former description of the second division seems adequate, and as I have nothing new to add, I will quote it as there described. £* *m ^••> •••„ /«*t • ^90 + % *r<b / *A % * / s *": **« ^ •« •••••• CA -x^iP^ vAi/,;x.. • • /m^ «••*. *
RMPF9MBB–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. IT.M M'/.-^. Fig. 221.—Transverse section through the metanephros, mesonephros, gonads and neighboring parts of an 8-day chick, bl. v., Blood vessels (sinusoids). B. W., Body-wall. col. T. M't'n., Collecting tubules of the metanephros. M. D., Miillerian duct. M's't., Mesen- tery, n. t. i. z., Inner zone of nephrogenous tissue (metanephric). n. t. o. z Outer zone of the nephrogenous tissue. Symp. Gn., Sympathetic gang- lion of the twenty-first spinal ganglion. V. C, Centrum of vertebra. Other abbrev
RMRHRANN–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OBSERVATIONS ON COLEOPTERA. iSl tion would not be one of direct selective value and be greatly developed by selection, because those individuals with an abun- dant supply of exuvial fluid would have a far better chance of passing safely these critical periods than those with a lesser supply of the exuvial fluid. Changes in tJie Integument. - -In the integument the preparatory changes preceding ecdysis begin before the larvae cease feeding and consist largely in the withdrawal of the protoplasmic processes of the hypodermal c
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ALIMENTARY TRACT AND ITS APPENDAGES 329 another system, that of the recurrent bronchi, develops from the air-sacs wliich we now go on to consider. M&MM-. Fig. 190. — Transverse section through the lungs of a chick embryo of 11 days, a. th. A. S., Anterior thoracic air-sac. Ao., Aorta. Aur. d., s., Right and left auricles. B. d., s.. Right and left ducts of Botallus. F., Feather germs. Li., Liver. P. C, Pericardial cavity. " p. p. M., Pleuroperitoneal membrane. P. v., Pulmonary vein. Par'b. Stock Photo](https://c8.alamy.com/comp/PFA7BK/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-alimentary-tract-and-its-appendages-329-another-system-that-of-the-recurrent-bronchi-develops-from-the-air-sacs-wliich-we-now-go-on-to-consider-mampmm-fig-190-transverse-section-through-the-lungs-of-a-chick-embryo-of-11-days-a-th-a-s-anterior-thoracic-air-sac-ao-aorta-aur-d-s-right-and-left-auricles-b-d-s-right-and-left-ducts-of-botallus-f-feather-germs-li-liver-p-c-pericardial-cavity-quot-p-p-m-pleuroperitoneal-membrane-p-v-pulmonary-vein-parb-PFA7BK.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ALIMENTARY TRACT AND ITS APPENDAGES 329 another system, that of the recurrent bronchi, develops from the air-sacs wliich we now go on to consider. M&MM-. Fig. 190. — Transverse section through the lungs of a chick embryo of 11 days, a. th. A. S., Anterior thoracic air-sac. Ao., Aorta. Aur. d., s., Right and left auricles. B. d., s.. Right and left ducts of Botallus. F., Feather germs. Li., Liver. P. C, Pericardial cavity. " p. p. M., Pleuroperitoneal membrane. P. v., Pulmonary vein. Par'b. Stock Photo")
RMPFA7BK–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ALIMENTARY TRACT AND ITS APPENDAGES 329 another system, that of the recurrent bronchi, develops from the air-sacs wliich we now go on to consider. M&MM-. Fig. 190. — Transverse section through the lungs of a chick embryo of 11 days, a. th. A. S., Anterior thoracic air-sac. Ao., Aorta. Aur. d., s., Right and left auricles. B. d., s.. Right and left ducts of Botallus. F., Feather germs. Li., Liver. P. C, Pericardial cavity. " p. p. M., Pleuroperitoneal membrane. P. v., Pulmonary vein. Par'b.
RMRHM9JG–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 36 J. MARSHALL ET AL. Figure 6. Short arm ot the radnlar sac and teeth within it. Three views of teeth are shown. Each panel on the right is a magnified image of that on the left. The pharynx would he on the right side of all panels. Scale bars in E and F are 50 p.m and also apply to A, C and B. D, respectively. (A, B) Comparison of radular sac content with tooth content. The basal ends (*) of two teeth are visible. Granular materials inside and outside the teeth are similar in appearance. (C, D) Dense granules (stained blue
RMPFA7AT–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 336 THE DEVELOPMENT OF THE CHICK. Fig. 193. — Reconstruction of the septum transversum and associated mesenteries of a chick embryo of 5 to 6 days. (After Ravn.) A. Entire. B. After removal of the hver and sinus venosus. A., Aorta, ac. M., Accessory mesentery. cav. F., Caval fold. coel. F., Cccliac fold. Her., Hiatus communis reces- sum. Int., Intestine. Lg., Lung. Liv., Liver, m. p., Pleuro- pericardial membrane, pvl., Primary ventral ligament of the liver. Sv., Sinus venosus. mesentery), uniting
RMRHNT0T–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. cap. Pectinaria sand Fig. 5 Fig. 6 en. Fig. 7 en.. ex1. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Mar
RMPFA87P–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. >?o/>/ L. >^.ki BJj. B/./.. </.*'<?.. 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. New York : Henry Holt
RMRHM98M–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 76 G. B. BRUMWELL AND V. J. MARTIN. Figure 5. Single-plane confocal images of controls. Scale bars are in /Mm. (a, b) Tentacles processed with the RFamide antibody revealed a nerve net (a), whereas tentacles processed without the RFamide antibody did not (b). (c, d) Tentacles stained with the JD1 antibody revealed a nerve net (o, whereas tentacles processed using the same protocol minus the JD1 anti- body did not (d). 2500 (Bode el ai, 1973). The authors report 5600 neurons in the adult. Similarly, regenerating heads show no
RMPF9M8T–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 422 THE DEVELOPMENT OF THE CHICK and membrane bones of the skull before it begins in the vertebrae. It takes place in antero-posterior order, so that a series of stages may be followed in a single embryo (cf. Fig. 242). There are three main centers for each vertebra, viz., one in the body and one in each neural arch. The ossification of the centrum is almost -;yedobl Ji^ 3f ^,1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabili
RMRHP2BP–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 3L TIP. FIGURE 1. A. Configuration of chromosomes, sketched with needles of micromanipulator in position. B. Behavior of the two adhered ends while the needles were being moved apart. 1. Original position. 2. As the streching begins a thread-like material pulls out between the two ends. 3. The maximum extent of the stretching of the material between the two tips. 4. The thread-like material breaks and disappears leaving the ends free and relaxed. C. The same configuration of chromosomes as in A, after the ends have broken ap
RMPFA7A4–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 346 THE DEVELOPMENT OF THE CHICK to the left side of the body-cavity (Fig. 188), and which is exaggerated by the rapid growth of the dorsal pancreas (Choron- schitzky). The spleen is thus genetically related to the wall of the great omentum, and lies outside the cavity of the latter. The cells of the spleen are proliferated from a peritoneal thicken- ing, which may be compared in this respect to the germinal epithelium. It is recognizable at ninety-six hours, and the mass formed by its proliferatio
RMRHP36B–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IQO x z o 50 150- or O I 10 0 - u 60 KCl.. C*CL2 DAYS FIGURE 6. Oxygen consumption of a larval Eustrongylides in isotonic solutions of various cations. The upper part of the figure shows the average Oz consumption on specified days, the lower part the average Oa consumption over the entire period of observation.. 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
RMPF9M9Y–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URINOGENITAL SYSTEM 403 gland at this time, but docs not open into the cloaca. Indeed, the opening is not established until after the hen is six months old (Gasser.). Fig. 231. — Photograph of a cross-section of an embryo of 8 days through the ostia tubse abdominaha. a. A. S., Neck of abdominal air-sac. O. T. a., Ostium tubse abdominale. M's't.ac, Accessory mesentery, pi. C. r., 1., Right and left pleural cavities. Rec. pn. ent. r., Right pneumato-enteric recess. V. c. a. 1., Left anterior vena
RMRHMWRP–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ^i*J*r*-r / -. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^ fe' ^ WoVv .0 £â â¢â â¢Â©. ⢠5 -a'*' -© i o*" J â¢â¢â¢ ^ ⢠i^« V. *» â â¦;.,. â ". '^' -I / 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. New York : Henry Holt Stock Photo](https://c8.alamy.com/comp/PFA8B9/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-fe-wovv-0-5-a-i-oquot-j-i-v-quot-i-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-new-york-henry-holt-PFA8B9.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^ fe' ^ WoVv .0 £â â¢â â¢Â©. ⢠5 -a'*' -© i o*" J â¢â¢â¢ ^ ⢠i^« V. *» â â¦;.,. â ". '^' -I / 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. New York : Henry Holt Stock Photo")
RMPFA8B9–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^ fe' ^ WoVv .0 £â â¢â â¢Â©. ⢠5 -a'*' -© i o*" J â¢â¢â¢ ^ ⢠i^« V. *» â â¦;.,. â ". '^' -I / 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. New York : Henry Holt
RMRHKN5G–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 1. Differential interference contrast image of a partially disassociated spetmatozeugma. The arrow indicates the head regions of spermatozoa that have remained joined. The tail region of the spermatozeugma has remained intact. Scale bar = 12 jim. Figure 2. Video image of spermatozeugmata (arrow) and a primary oocyte (O) positioned between the pharynx (PH) and body wall of an extended polypide. The intertentacular organ (ITO) consists of a proximal and distal chamber. Scale bar = 50 /itn. Figure 3. A video image of thr
RMPFA7NT–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Fig. 134. — Circulation in the embryo and the yolk-sac at the stage of about 22 s, drawn from below. Note differentiation of branches of the vitelline arteries. Injected. (After Popoff.) 1, Marginal vein. 2, Region of venous network. 3, Carotid loop. 4 r, 41, Right and left anterior vitelline veins. 5, Heart. 6, Anterior intes- tinal portal. 7, Dorsal aorta. 8, Branches of vitelline arteries.. Please note that these images are extracted from scanned page images that may have been digitally enhanced
RMRHRKN8–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 262 E. A. ANDREWS. areolar tissue and a delicate epidermis underlies the shell and is continuous with the areolar tissue. The internal anatomy and the external modelling is shown by the series of sections, Figs. 7, 8, 9, cut along the lines 7, 8, 9 of Fig. 3. The organ is essentially a thick, flat plate with a groove on its posterior face dividing it into a smaller median part that we will call the median mass and a larger external mass, M.M. and E.v.in. in Fig. 7.. The groove is made much deeper by the fact that a great rid
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URIXOGENITAL SYSTEM 379 taneously: primary tubules are formed in each somite from the most ventral portion of the nephrogenous tissue; then secondary tubules later from an intermediate portion, and tertiary tubules later yet from the dorsal portion. Fig. 217 represents a transverse section through the middle. fc^"'o" .wyt. Tl i^ G/om. ^^- germ.fp. %^ Pjq 217.—Transverse section through the middle of the Wolffian body of a chick embryo of 96 hours. Ao., Aorta. Coel., Coelome. Col. T., Stock Photo](https://c8.alamy.com/comp/PF9MBR/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-the-urixogenital-system-379-taneously-primary-tubules-are-formed-in-each-somite-from-the-most-ventral-portion-of-the-nephrogenous-tissue-then-secondary-tubules-later-from-an-intermediate-portion-and-tertiary-tubules-later-yet-from-the-dorsal-portion-fig-217-represents-a-transverse-section-through-the-middle-fcquotoquot-wyt-tl-i-gom-germfp-pjq-217transverse-section-through-the-middle-of-the-wolffian-body-of-a-chick-embryo-of-96-hours-ao-aorta-coel-coelome-col-t-PF9MBR.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URIXOGENITAL SYSTEM 379 taneously: primary tubules are formed in each somite from the most ventral portion of the nephrogenous tissue; then secondary tubules later from an intermediate portion, and tertiary tubules later yet from the dorsal portion. Fig. 217 represents a transverse section through the middle. fc^"'o" .wyt. Tl i^ G/om. ^^- germ.fp. %^ Pjq 217.—Transverse section through the middle of the Wolffian body of a chick embryo of 96 hours. Ao., Aorta. Coel., Coelome. Col. T., Stock Photo")
RMPF9MBR–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE URIXOGENITAL SYSTEM 379 taneously: primary tubules are formed in each somite from the most ventral portion of the nephrogenous tissue; then secondary tubules later from an intermediate portion, and tertiary tubules later yet from the dorsal portion. Fig. 217 represents a transverse section through the middle. fc^"'o" .wyt. Tl i^ G/om. ^^- germ.fp. %^ Pjq 217.—Transverse section through the middle of the Wolffian body of a chick embryo of 96 hours. Ao., Aorta. Coel., Coelome. Col. T.,
RMRHP1NN–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D FIG. 1. Camera lucicla drawings of material fixed immediately after exposure to the electric current. Cilia omitted. A. Fragment from posterior region of organism, with one intact macronucleus and t,wo micronuclei. One of the latter is faint and elongate. Peristome lacking. Such fragments do not regenerate. X 1157. B. Fragment with two macronuclei and one micronucleus, the latter faint and ghost-like. X 1144. C. Fragment from anterior region of organism. Peristome intact. X 1120. D. Intact individual. The macronuclei at th
RMPFA7XJ–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 192 THE DEVELOPMENT OF THE CHICK and the angle of the body-cavity; it consists of two parts, viz., the primary tubule and the supplementary part. It never pos- sesses a continuous lumen, though there is often a cavity in the supplementary part, which opens into the body-cavity through the nephrostome (Fig. 112 B). The pronephros of the chick is a purely vestigial organ, of no apparent functional significance. Its development is accord- ingly highly variable, and it often happens that the right and
RMRHMDRN–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 20 ms A2 B2. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
RMPFA865–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 137 (a diagrammatic outline is first given and a detailed description follows). The somatopleure becomes elevated in the form of a fold surrounding the embryo; this fold begins first in front of the head of the embryo as the head-fold of the amnion, which 0/3. yes. Mesenc auJ*. Vojn Fig. 74. — Head of the same embryo from the ventral side. Abbreviations as before.. Please note that these images are extracted from scanned page images that may have been digitally enh
RMRHN4NN–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLONY SPECIFICITY IN PEROPHORA 173. FIGURES 1-7. A typical example of fusion. (Fig. 1): 50 min before contact. (Fig. 2): 16 min after contact. (Fig. 3): 2 h after contact. (Fig. 4): 5 h after contact. The arrowhead indicates the test of the 1-stolon encroached upon the test of the t-stolon. ts, terminus of the septum in the t-stolon. (Fig. 5): 6 h after contact. The arrowhead shows the union of epidermis between the two stolons, ts, terminus of the septum in the t-stolon. (Fig. 6): 8 h after contact. The arrows indicates ep
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 374 THE DEVELOPMENT OF THE CHICK - Ao. - - Vsrs, wall, inasmuch as direct connection with the veins of the allantois is not yet esta]:>lishecl. The meatus venosus receives the omphalo- mesenteric veins, and the blood of the allantois by way of the subintestinal vein (the latter arrangement of very brief duration). Thus at this time all of the blood is mixed together in the sinus venosus, viz., that re- ceived through the ducts of Cuvier, presumably venous, and that received through the meatus ve Stock Photo](https://c8.alamy.com/comp/PF9MC5/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-374-the-development-of-the-chick-ao-vsrs-wall-inasmuch-as-direct-connection-with-the-veins-of-the-allantois-is-not-yet-esta-gtlishecl-the-meatus-venosus-receives-the-omphalo-mesenteric-veins-and-the-blood-of-the-allantois-by-way-of-the-subintestinal-vein-the-latter-arrangement-of-very-brief-duration-thus-at-this-time-all-of-the-blood-is-mixed-together-in-the-sinus-venosus-viz-that-re-ceived-through-the-ducts-of-cuvier-presumably-venous-and-that-received-through-the-meatus-ve-PF9MC5.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 374 THE DEVELOPMENT OF THE CHICK - Ao. - - Vsrs, wall, inasmuch as direct connection with the veins of the allantois is not yet esta]:>lishecl. The meatus venosus receives the omphalo- mesenteric veins, and the blood of the allantois by way of the subintestinal vein (the latter arrangement of very brief duration). Thus at this time all of the blood is mixed together in the sinus venosus, viz., that re- ceived through the ducts of Cuvier, presumably venous, and that received through the meatus ve Stock Photo")
RMPF9MC5–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 374 THE DEVELOPMENT OF THE CHICK - Ao. - - Vsrs, wall, inasmuch as direct connection with the veins of the allantois is not yet esta]:>lishecl. The meatus venosus receives the omphalo- mesenteric veins, and the blood of the allantois by way of the subintestinal vein (the latter arrangement of very brief duration). Thus at this time all of the blood is mixed together in the sinus venosus, viz., that re- ceived through the ducts of Cuvier, presumably venous, and that received through the meatus ve
RMRHMGM8–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ?-*?•- ;is» M - .•.s.f+fX- • •- -,.^/S^, v.^: - ; - .- .-,.,;•:,. , ±^ ^: B. 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. W
RMPF9MB3–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 388 THE DEVELOPMENT OF THE CHICK of the cardinal vein, and is in contact, on its median face, with the proper nephrogenous tissue (inner zone); the latter shades into the outer zone, the cells of which are arranged concentrically with reference to the other parts. The relations subsequently established may be summarized in a few words; the inner zone of tissue grows and branches pari passu with the growth and branching of the metanephric diverticulum, so that the termina- tion of every collecting t
RMRHN6NM–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HABROBRACON OOGKNESIS 45 period that the accessory nuclei are increasing in volume they are also accumulating protein. If the new protein in the matrix is synthesized in situ, then functional ribosomes must be included among the RXP particles in pseudonucleoli. The contents of the accessory nuclei are contributed to the ooplasm about the time the ovarian oocyte enters meiotic metaphase I. Yolk spheres The second organelle characteristically found in the vitellogenic oocyte is the yolk sphere (Figs. IB, 4 ys). These stain int
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Vojn Fig. 74. â Head of the same embryo from the ventral side. Abbreviations as before.. Ifec.opt ^'V^i.","*'''^" '''^'"''' *''="°" °f *â¢>« '"'^'l of ^^ embryo of 18 s the isthmus"V?o1"'preo1al'iuro'rnl o'/^7"^. ^^"'- «<â «-" "f opticus. S.'v.Psiâu!'veno:us! ^'therafbre^Siot as b^frre."^"' ^^^^^^"^ immediately turns backwards over the head, forming a complete cap (F.gs. 67, 71, 75, etc.); the side limbs of t Stock Photo](https://c8.alamy.com/comp/PFA862/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-vojn-fig-74-head-of-the-same-embryo-from-the-ventral-side-abbreviations-as-before-ifecopt-viquotquotquot-quot-=quotquot-f-gt-quotl-of-embryo-of-18-s-the-isthmusquotvo1quotpreo1aliurornl-o7quot-quot-lt-quot-quotf-opticus-svpsiu!venous!-therafbresiot-as-bfrrequotquot-quot-immediately-turns-backwards-over-the-head-forming-a-complete-cap-fgs-67-71-75-etc-the-side-limbs-of-t-PFA862.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Vojn Fig. 74. â Head of the same embryo from the ventral side. Abbreviations as before.. Ifec.opt ^'V^i.","*'''^" '''^'"''' *''="°" °f *â¢>« '"'^'l of ^^ embryo of 18 s the isthmus"V?o1"'preo1al'iuro'rnl o'/^7"^. ^^"'- «<â «-" "f opticus. S.'v.Psiâu!'veno:us! ^'therafbre^Siot as b^frre."^"' ^^^^^^"^ immediately turns backwards over the head, forming a complete cap (F.gs. 67, 71, 75, etc.); the side limbs of t Stock Photo")
RMPFA862–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Vojn Fig. 74. â Head of the same embryo from the ventral side. Abbreviations as before.. Ifec.opt ^'V^i.","*'''^" '''^'"''' *''="°" °f *â¢>« '"'^'l of ^^ embryo of 18 s the isthmus"V?o1"'preo1al'iuro'rnl o'/^7"^. ^^"'- «<â «-" "f opticus. S.'v.Psiâu!'veno:us! ^'therafbre^Siot as b^frre."^"' ^^^^^^"^ immediately turns backwards over the head, forming a complete cap (F.gs. 67, 71, 75, etc.); the side limbs of t
RMRHMH04–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PARA TETRAMITUS 251. FIGURE 6. Irregular vahlkampfids. A. Feeding, phase contrast, Bar = 5 Mm. B. Contractile vacuole (black) and nucleus phase contrast. Bar = 5 nm. C. TEM with bacteria in food vacuoles. n = nucleus, s = spore, v = food vacuole. Bar = 2 by Page (1967, 1976) for some strains. The cytoplasm contained many granules and conspicuous vacuoles which contained bacteria, interpreted to be food vacuoles. Ectoplasmic and small rounded forms. In actively growing cultures rounded forms with thin or indistinct walls and
RMPFA85P–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 139 depression bounded in front hy the ectamnion, and on the sides by the amnio-cardiac vesicles of the body-cavity (Fig. 65). The floor of the depression is the proamnion. Just before the for- mation of the head-fold proper, the ectamnion in front of the head becomes irregularly thickened to such an extent as sometimes to present an actually villous surface (Fig. 77; cf. Fig. 67). The head-fold of the amnion begins to form at about the same time as the cephalic fl
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEREIS SUCCINEA IN HIGH SALINITIES 155 Nereis succlnea Average ST5Q Salton Sea water • T= 21 - 23 C O T = 34°C "Instant Ocean" T= 21 - 23 C CS. 50 30 40 50 60 70 Medium: °oo,salinity 80 FIGURE 1. Survival time of Nereis snccinca in increasing concentrations of Salton Sea water, expressed as average ST.™. Points are averages of all trays (initially 10 worms each) in each salinity, with the standard error indicated. Arrows indicate the Critical Salinity (CSso) where survival is reduced to 50% of that in 36C/CC Salt Stock Photo](https://c8.alamy.com/comp/RHMHYP/the-biological-bulletin-biology-zoology-biology-marine-biology-nereis-succinea-in-high-salinities-155-nereis-succlnea-average-st5q-salton-sea-water-t=-21-23-c-o-t-=-34c-quotinstant-oceanquot-t=-21-23-c-cs-50-30-40-50-60-70-medium-oosalinity-80-figure-1-survival-time-of-nereis-snccinca-in-increasing-concentrations-of-salton-sea-water-expressed-as-average-st-points-are-averages-of-all-trays-initially-10-worms-each-in-each-salinity-with-the-standard-error-indicated-arrows-indicate-the-critical-salinity-csso-where-survival-is-reduced-to-50-of-that-in-36ccc-salt-RHMHYP.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEREIS SUCCINEA IN HIGH SALINITIES 155 Nereis succlnea Average ST5Q Salton Sea water • T= 21 - 23 C O T = 34°C "Instant Ocean" T= 21 - 23 C CS. 50 30 40 50 60 70 Medium: °oo,salinity 80 FIGURE 1. Survival time of Nereis snccinca in increasing concentrations of Salton Sea water, expressed as average ST.™. Points are averages of all trays (initially 10 worms each) in each salinity, with the standard error indicated. Arrows indicate the Critical Salinity (CSso) where survival is reduced to 50% of that in 36C/CC Salt Stock Photo")
RMRHMHYP–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEREIS SUCCINEA IN HIGH SALINITIES 155 Nereis succlnea Average ST5Q Salton Sea water • T= 21 - 23 C O T = 34°C "Instant Ocean" T= 21 - 23 C CS. 50 30 40 50 60 70 Medium: °oo,salinity 80 FIGURE 1. Survival time of Nereis snccinca in increasing concentrations of Salton Sea water, expressed as average ST.™. Points are averages of all trays (initially 10 worms each) in each salinity, with the standard error indicated. Arrows indicate the Critical Salinity (CSso) where survival is reduced to 50% of that in 36C/CC Salt
RMPFA89X–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 97 the undifferentiated mass of the primitive streak. These condi- tions must be born in mind in the following description. The Neural Groove and Folds. Shortly after the formation of the head-fold the center of the medullary plate becomes sunk in the form of a deep groove beginning a short distance behind the f:-:>-^ ^. â¢/^2.' 'â m.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CA2+ DEPENDENCE OF HYDROID SETTLEMENT 49 O CD § cc 1.2 2.2 1.6 1.2 B 40 120 160. 40 80 120 time (sec) 160 Figure 4. |Ca2*], transients during atrichous isorhiza discharge in (A) Ca^-free artificial seawater (ASW), (B) Mg-+-supplemented ASW (200 mM Mg2+), (C) 20 pM Gd' + -ASW. and (D) regular ASW. this is the first demonstration of Ca2 +-dependent nemato- cyst discharge in larvae. We also confirmed and quantified the Ca2+-dependence of actinular settlement in Tubitlaria mesembryanthemum. Reduced-Ca2 + seawater also inhibits m Stock Photo](https://c8.alamy.com/comp/RHMCPM/the-biological-bulletin-biology-zoology-biology-marine-biology-ca2-dependence-of-hydroid-settlement-49-o-cd-cc-12-22-16-12-b-40-120-160-40-80-120-time-sec-160-figure-4-ca2-transients-during-atrichous-isorhiza-discharge-in-a-ca-free-artificial-seawater-asw-b-mg-supplemented-asw-200-mm-mg2-c-20-pm-gd-asw-and-d-regular-asw-this-is-the-first-demonstration-of-ca2-dependent-nemato-cyst-discharge-in-larvae-we-also-confirmed-and-quantified-the-ca2-dependence-of-actinular-settlement-in-tubitlaria-mesembryanthemum-reduced-ca2-seawater-also-inhibits-m-RHMCPM.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CA2+ DEPENDENCE OF HYDROID SETTLEMENT 49 O CD § cc 1.2 2.2 1.6 1.2 B 40 120 160. 40 80 120 time (sec) 160 Figure 4. |Ca2*], transients during atrichous isorhiza discharge in (A) Ca^-free artificial seawater (ASW), (B) Mg-+-supplemented ASW (200 mM Mg2+), (C) 20 pM Gd' + -ASW. and (D) regular ASW. this is the first demonstration of Ca2 +-dependent nemato- cyst discharge in larvae. We also confirmed and quantified the Ca2+-dependence of actinular settlement in Tubitlaria mesembryanthemum. Reduced-Ca2 + seawater also inhibits m Stock Photo")
RMRHMCPM–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CA2+ DEPENDENCE OF HYDROID SETTLEMENT 49 O CD § cc 1.2 2.2 1.6 1.2 B 40 120 160. 40 80 120 time (sec) 160 Figure 4. |Ca2*], transients during atrichous isorhiza discharge in (A) Ca^-free artificial seawater (ASW), (B) Mg-+-supplemented ASW (200 mM Mg2+), (C) 20 pM Gd' + -ASW. and (D) regular ASW. this is the first demonstration of Ca2 +-dependent nemato- cyst discharge in larvae. We also confirmed and quantified the Ca2+-dependence of actinular settlement in Tubitlaria mesembryanthemum. Reduced-Ca2 + seawater also inhibits m
RMPFA78B–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Carext, I Cdr.com.. Fig. 207. — Reconstruction of the aortic arches of a 6-day chick embryo from a series of sagittal sections. A. Left side. B. Right side. Car. com., Common carotid. Car. ext., External carotid. Car. int., Internal carotid. D. a.. Ductus arteriosus. 3, 4, and 6, Third, fourth, and sixth aortic arches. and gradual disappearance of this part of the primitive dorsal aorta, viz., the elongation of the neck and the reduction of the blood current. It will be seen that relatively little
RMRHN1BB–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. e f g FIGURE 4. Histochemical localization of AChE activity in H. roretzi whole and quarter embryo of various ages, (a, b, c) Dechorionated whole embryos after 22 h (a), 28 h (b), and 32 h (c) of development, respectively. In (a) muscle cells of the caudal tip region do not produce AChE, but in (b) and (c) they show the enzyme activity. Arrowhead in (b) indicates the primordial pharynx with AChE activity and arrowheads in (c) indicate small spots with the enzyme activity, (d) B4.1 quarter embryos with AChE activity (30 h of
RMPFA7CG–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ALIMENTARY TRACT AND ITS APPENDAGES 315 from the intermediate section of the cloaca or urodseum; this is a relatively short division of the cloaca which receives the renal and reproductive ducts in its dorsal wall by two pairs of openings; it is bounded from the larger anterior division, coprodseum, by a rather low circular fold; the coprodseum passes gradually, with- out a sharp line of division, into the rectum. The early embryological history of these parts has been con- sidered in the preceding
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A MODIFICATION OF THE URODELE TESTIS. 147 testis in Ambystoma, or the bluntly-rounded termination of the organ in other L rodele males lacking an appendage. To understand the origin and significance of the appendage it i- necessary to note its seasonal changes, both in gross appearamv and in histological detail. These will be first outlined as they occur in Plethodon glntinosus, a species in which the appendage ib prat tically a constant feature in the adult mak-. It is ni"-t <.«»ii-piriin- in animals killed from May Stock Photo](https://c8.alamy.com/comp/RHPAGJ/the-biological-bulletin-biology-zoology-biology-marine-biology-a-modification-of-the-urodele-testis-147-testis-in-ambystoma-or-the-bluntly-rounded-termination-of-the-organ-in-other-l-rodele-males-lacking-an-appendage-to-understand-the-origin-and-significance-of-the-appendage-it-i-necessary-to-note-its-seasonal-changes-both-in-gross-appearamv-and-in-histological-detail-these-will-be-first-outlined-as-they-occur-in-plethodon-glntinosus-a-species-in-which-the-appendage-ib-prat-tically-a-constant-feature-in-the-adult-mak-it-is-niquot-t-ltii-piriin-in-animals-killed-from-may-RHPAGJ.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A MODIFICATION OF THE URODELE TESTIS. 147 testis in Ambystoma, or the bluntly-rounded termination of the organ in other L rodele males lacking an appendage. To understand the origin and significance of the appendage it i- necessary to note its seasonal changes, both in gross appearamv and in histological detail. These will be first outlined as they occur in Plethodon glntinosus, a species in which the appendage ib prat tically a constant feature in the adult mak-. It is ni"-t <.«»ii-piriin- in animals killed from May Stock Photo")
RMRHPAGJ–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A MODIFICATION OF THE URODELE TESTIS. 147 testis in Ambystoma, or the bluntly-rounded termination of the organ in other L rodele males lacking an appendage. To understand the origin and significance of the appendage it i- necessary to note its seasonal changes, both in gross appearamv and in histological detail. These will be first outlined as they occur in Plethodon glntinosus, a species in which the appendage ib prat tically a constant feature in the adult mak-. It is ni"-t <.«»ii-piriin- in animals killed from May
RMPFA8EM–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. -H â ^A-: ^⢠^ '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. New York : Henry Holt
RMRHMB1X–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Certificate of Organization Articles of Amendment Bylaws Certificate of Organization. Articles of Amendment (On File in the Office of the Secretary of the Commonwealth) No. 3170 We, Alpheus Hyatt, President. William Stanford Stevens. Treasurer, and William T. Sedgwick, Edward G. Gardiner, Susan Mims and Charles Sedgwick Minot being a majority of the Trustees of the Marine Biological Laboratory in compliance with the requirements of the fourth section of chapter one hundred and fifteen of the Public Statutes do hereby certify
RMPFA7TX–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 208 THE DEVELOPMENT OF THE CHICK instead of in front of them as before. Therefore in cross-sections, in front of the lateral mesocardia, the pleural grooves appear as dorsal projections of the parietal (later pericardial) cavity, separated from one another in the middle line by the oesophagus (Fig. 118). The relations of the three divisions of the embryonic body- cavity thus established may be described as follows: the parietal cavity contains the heart, and is therefore the prospective peri- ,-;rg
RMRHP9RJ–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12S BENJAMIN B. LEAVITT The number of each species of euphausiids has been obtained either by actual count or by the above-mentioned sampling method. To make all catches comparable, the counts of each individual species have then been reduced to a 2-meter net in 2 hours basis. A simple additional calculation of numbers of euphausiids per unit volume (50 cc. of total catch) then shows the relative importance of the former in the latter. The following example will illustrate this method of calculation ; Station 1735; Haul 2; d
RMPFA7T6–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. PART II THE FOURTH DAY TO HATCHING ORGANOGENY, DEVELOPMENT OF THE ORGANS CHAPTER VII THE EXTERNAL FORM OF THE EMBRYO AND THE EMBRYONIC MEMBRANES I. The External Form General. The development of the external form of the em- bryo is conditioned by the order of development of the organs. The early form is thus given by the nervous system, somites. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th
RMRHNRGK–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 DAVID G. COOK METHODS The Biotic Census of Cape Cod Bay is a continuing long term investigation of the fauna of this area. Samples are taken uniformly over the area of the Bay at predetermined locations on a grid of nautical mile squares. Quantitative samples are being taken with a Smith-Mclntyre grab in the middle and at each corner of every alternate quadrat. Material is being washed through a series of screens down to 0.5 mm mesh diameter, narcotized in propylene phenoxytol, fixed in formalin and stored in 80% ethyl al
RMPFA82G–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 156 THE DEVELOPMENT OF THE CHICK ment of the nuclei leaves thin non-nucleated strips (septa) be- tween adjacent neuromeres. The interneuromeric projections are most pronounced laterally and fade out dorsally and ventrally. Behind the neuromeric portion of the hind-brain is a portion extending to the posterior end of the fourth mesoblastic somite from which the twelfth cranial nerve arises. The Neural Crest and the Cranial and Spinal Ganglia. The cranial and spinal ganglia owe their origin to a stru
RMRHP6TB–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ' I I I I ' I ' ' I I I ' ' ' I I I I I I I I I I I I I I I 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.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Ma
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^^ fnf. prUr. -.••.®.vf:»,V ^^^^«" >'*?^V« *tV4^ (» •Se' Mes.. 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. New York : Henry Holt Stock Photo](https://c8.alamy.com/comp/PFA8CB/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-fnf-prur-vfv-quot-gtv-tv4-se-mes-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-new-york-henry-holt-PFA8CB.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^^ fnf. prUr. -.••.®.vf:»,V ^^^^«" >'*?^V« *tV4^ (» •Se' Mes.. 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. New York : Henry Holt Stock Photo")
RMPFA8CB–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. ^^ fnf. prUr. -.••.®.vf:»,V ^^^^«" >'*?^V« *tV4^ (» •Se' Mes.. 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. New York : Henry Holt
