. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 434 ANATOMY OF VERTEBRATES. 294 of the penis ' and clitoris: in the Crocodilia, besides com- municating with that structure, the peritoneal canals open out- wardly upon papillae, situated on each side of the base of the penis ^ and clitoris. These are the exceptions, in the reptilian class, to the typical character of the jDeritoneum as a closed ' serous ' sac. In most Rejitiles pigmental cells are blended with or supersede the ordinary tessellated lining of epithelial cells in certain parts of the peritoneal surface. Th
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 434 ANATOMY OF VERTEBRATES. 294 of the penis ' and clitoris: in the Crocodilia, besides com- municating with that structure, the peritoneal canals open out- wardly upon papillae, situated on each side of the base of the penis ^ and clitoris. These are the exceptions, in the reptilian class, to the typical character of the jDeritoneum as a closed ' serous ' sac. In most Rejitiles pigmental cells are blended with or supersede the ordinary tessellated lining of epithelial cells in certain parts of the peritoneal surface. The mouth in Reptiles gives passage to respiratory currents as well as to the food in the Perennibranchiates, and in all the air-breathers along that extent of the cavity which is poste- rior to the palato-nares, fig. 294, b, h -. the Crocodilia alone having the nasal distinct from the oral passage. In Chelonia, the jaws with their horny covering form, as in Gymnodont fishes, the first portal to the alimentary canal: in many Batrachia the in- tegument passes evenly over the alveolar margins of the jaws, as in fig. 294, a, a : in Ophidia, Saiiria, and Crocodilia, a narrow tract of soft and vascular integument intervenes be- tween the scale-cladborder of the mouth and the jaws ; sinking into a more or less shallow groove, which de- fines the lips and receives the secretion of a row of mucous crypts : but such lips are hard and inflexilile : in certain Frogs and Toads they are of softer texture : but in none are produced or jirehensile. The walls of the mouth expand into pouches in certain Reptiles, as e. g. at the sides of the face in male Frogs, below the tongue in Hyla, and produced from the same part into a cons]iicu- ous gnlar bag, as in the Draco volans, fig. 303, d. But these pouches receive air, not, as in some higher Vertebrates, food ; and usually relate to the powers of voice. Tlic Ijony walls of the mouth have been already described; the ' XX. vol. iv. p. 62, preps, nos.
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
