MALE ORGANS OF BATRACHIANS. 



377 



385 



In most Newts the testis is divided into two lobes, fig. 387, u, 

 one, usually the larger, in advance of the other : I have observed 

 three detached lobes or testes on each side. In the Salamander 

 there may be one or two smaller lobes or accessory testes, besides 

 the two chief divisions of the gland.' 



In tailless Batrachians the testes, in accordance with the shajDe 

 of the body, jDresent a full oval form, compact and undivided : they 

 are situated, as shown in the Frog, fig. 385,_/, /, on the ventral 

 side of the anterior half of the kidneys, g, g, having an entire 

 investment of peritoneum, often deei:ily or brightly coloured by 

 pigmental cells, which forms a broad and short mesorchium, 

 suspending them to the renal glands and supporting the blood- 

 vessels and efferent ducts. Processes of peritoneum, filled with 

 fat, ib. I, I, diverge from the fore part of both bodies. 



In all Batrachians the testis consists of seminiferous caaca, more 

 elongated than the sperm-follicles of Fishes, shorter and straighter 

 than in higher Reptiles, having their blind ends next the capsule. 

 This consists of a fibrous or ' al- 

 bugineous ' tunic, beneath the 

 serous one : both have been re- 

 moved to show the tubuli testis 

 in Swammerdam's accurate figure, 

 fig. 386. The semen is conveyed 

 hj short transverse efferent ducts, 

 h, to a common longitudinal canal, 

 i. In the Menopome about ten 

 vasa elFerentia quit the elong- 

 ated testes and enter the common 

 canal, which extends along the an- 

 terior three-fourths of the kidney, 

 and at its fore-end is connected 

 with the ligamentous remnant of 

 the duct of the Wolffian body : it 

 is thence reflected back along the 

 outer border of the kidney, receiv- 

 ino; in its course toward the cloaca 

 the ureters, which are short 

 transverse or oblique tubes, from ten to twenty in number : the 

 urino-seminal canal, supported by a narrow fold of peritoneum, 

 forms a few slight bends, and gradually expands as it approaches its 

 termination at the back part of the cloaca. In Sieboldia maxima 

 the longitudinal canal which receives the short efferent ducts is 



' XX. vol. iv. p. 53. 

 VOL. I. P P 



Cienprative organs of male Frog. COLXX. 



