. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. FEMALE ORGANS OF REPTILES. 5(53 392 â ifconeni of jionis ; e"ropa'a. xxxviir. 393 ischium, and extended along the under (ventral) surface of the penis to the glans. This muscle folds up the penis in retracting it within the cloaca, and at the same time closes thereby the orifice of the rectum, fig. 390, A, and that of the allantoic bladder, ib. M. Erection is fol- lowed by eversion of the cloaca, effected by its ' sphincter.' The developement of the jjenis bears relation to the physical imjjedimcnts to c
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. FEMALE ORGANS OF REPTILES. 5(53 392 â ifconeni of jionis ; e"ropa'a. xxxviir. 393 ischium, and extended along the under (ventral) surface of the penis to the glans. This muscle folds up the penis in retracting it within the cloaca, and at the same time closes thereby the orifice of the rectum, fig. 390, A, and that of the allantoic bladder, ib. M. Erection is fol- lowed by eversion of the cloaca, effected by its ' sphincter.' The developement of the jjenis bears relation to the physical imjjedimcnts to coitus, caused by shape, extent, and completeness of the shell, and by the medium in which the act takes place: thus the penis is least develojied in the marine sp)ecies, with a flattened carapace and incomplete plastron. The glans penis is trilobate in Trioiiyx. In the Crocodile the testes are longer than in Chelonia, and rather more in advance of the kidneys. The penis is single, with a dorsal groove, continued forward on a slender conical jji'ocess. It consists of a firm fibrous cavernous structure, commencing by two crura, and becoming softer towards the glans, which consist of vascular and erectile tissue : this is prolonged beyond the apex of the corpus cavernosum, so that two points are thus seen, one above the other: these points are united together on each side, and also in the middle, by a vertical septvun, which divides the intersijace between them into two culs-de-sac. The urethral groove is continued as far as the extremity of the upper jDoint, The peritoneal canals do not pene- trate the cavernous structure, but lead to and op>en outwardly on papilla3, situated on each side the base of the penis, within the cloaca. As Lizards are allied to Serpents by the double extra-cloacal penis, so Tortoises are allied to Crocodiles by the single intra-cloacal penis : the structure of this organ also presents two types, respectively characterising the scaled and scuted grou
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
