. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 156 THE MORPHOLOGY OF THE COMMON CRAYFISH. the eye-stalks and is united with adjaceat parts only by flexible cuticle, so that it is freely movable. This represents the whole of the sternal region, and probablj' more, of the ophthalmic somite. The sterna of fourteen somites are thus identifiable in the cephalothorax. The corresponding epimera are. Fig. iO.—Asfacus Jluviatilis.—The ophthalmic and antennulary somites ( X 3). /, ophthalmic, and IJ, antennulary sternum; 1, artic

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. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 156 THE MORPHOLOGY OF THE COMMON CRAYFISH. the eye-stalks and is united with adjaceat parts only by flexible cuticle, so that it is freely movable. This represents the whole of the sternal region, and probablj' more, of the ophthalmic somite. The sterna of fourteen somites are thus identifiable in the cephalothorax. The corresponding epimera are. Fig. iO.—Asfacus Jluviatilis.—The ophthalmic and antennulary somites ( X 3). /, ophthalmic, and IJ, antennulary sternum; 1, artic
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Image ID: RE0RGW
. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 156 THE MORPHOLOGY OF THE COMMON CRAYFISH. the eye-stalks and is united with adjaceat parts only by flexible cuticle, so that it is freely movable. This represents the whole of the sternal region, and probablj' more, of the ophthalmic somite. The sterna of fourteen somites are thus identifiable in the cephalothorax. The corresponding epimera are. Fig. iO.—Asfacus Jluviatilis.—The ophthalmic and antennulary somites ( X 3). /, ophthalmic, and IJ, antennulary sternum; 1, articular surface for eyestalk ; f, for antennule ; epm, epimeral plate ; pep, procephalio process ; /•, base of rostrum ; t, tubercle. represented, in the thorax, by the thin inner walls of the branchial chamber; the pleura, by the branchiostegites ; and the terga, by so much of the median region of the carapace as lies behind the cervical groove. That part of the carapace which is situated in front of this groove occu- pies the place of the terga of the head; while the low ridge, skirting the oral and prse-oral region, in which it terminates laterally, represents the pleura of the cephalic somites. The epimera of the head are, for the most part, very narrow; but those of the antennulary somite are broad plates (fig. 40, epm.), which constitute the posterior. 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.. Huxley, Thomas Henry, 1825-1895; Huxley, Thomas Henry, 1825-1895. Crayfish. New York : D. Appleton

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