. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. MALE ORGANS OF REPTILES. 579 the urine as well as the semen. Each uriniferous duct dilates into a long reservoir, describing a curve external to the kidney, the first or anterior being the longest, the rest successively shorter : they are connected together, eight to ten in numljer, so as to form, in appearance, a flattened semi-oval ' vesicula seminalis,' and terminate by a short wide canal, ib. m, common to them and the vas deferens, in the l)ack part of the cloaca. In the Frog about six transverse efferent ducts, fig.
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. MALE ORGANS OF REPTILES. 579 the urine as well as the semen. Each uriniferous duct dilates into a long reservoir, describing a curve external to the kidney, the first or anterior being the longest, the rest successively shorter : they are connected together, eight to ten in numljer, so as to form, in appearance, a flattened semi-oval ' vesicula seminalis,' and terminate by a short wide canal, ib. m, common to them and the vas deferens, in the l)ack part of the cloaca. In the Frog about six transverse efferent ducts, fig. 385, A, enter the longitudinal one, g, extending along the inner (mesial) side of the kidney, which is reflected round tlie fore end of that gland to form the beginning of the urino-seminal canal, ib. i, which courses along the outer (lateral) side of the kidney. This canal does not describe convolutions: it enlarges as it progressively receives the ureters, and suddenly expands beyond the kidney into a semi-oval ' vesicula seminalis,' ib. k, the outer half of which has folliculo-glandular walls, the inner half being smooth and with the character of a reservoir. A short duct conveys the contents of the vesicle to the back of the cloaca, ib. b; at the fore part is the orifice, c, of the allantoid bladder, e. No Batrachlan has the intromittent organ, or a vas deferens distinct from an ureter: a stage in the substitution of kidneys for Wolffian bodies is hereby obviously indicated. § 109. 3Iale Organs of Reptiles.—In the scaled Eeptiles the conduits from the kidney and the testes are distinct to the cloaca, and terminate there on separate jjapilliB. The testes, fig. 389, b, are compara- tively small and comjiact: they are always abdominal, with a complete investment of peritoneum, fre- quently coloured by pigment-cells. They have a strong albugineal tunic, and consist of blind semini- ferous tubes, fig. 388, much longer and more slender than in Batra- chians, and packed up in
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