URINOGENITAL ORGANS 



353 



but, owing to secondary processes of growth, as many as twenty 

 nephrostomes are later on met with in a single body- segment. The 

 number of nephrostomes in the entire kidney may amount to a 

 thousand or more. 



As regards the urinary duct and the relations of the entire 



A 



FIG. 279. DIAGRAM OF THE URINOGENITAL SYSTEM OF (A) A MALE AND (B) A 

 FEMALE URODELE ; FOUNDED ON A PREPARATION OF Triton tceniatus. 

 (After J. W. Spengel. ) 



Ho, testis ; Ve, Ve, vasa efFereiitia of testis, which open into the longitudinal canal 

 of the mesonephros, f ; a, collecting tubes of the mesonephros, which open into 

 the Wolffian (urinogenital) duct (Ig, Ig) ; in the female the latter serves 

 simply as the urinary duct ( Ur), and the system of the vasa efferentia (testicu- 

 lar network) is rudimentary ; mg, mg l (Od), Miillerian duct ; Of, coelomic 

 aperture of latter in the female ; Ov, ovary ; (?JV, anterior sexual portion of 

 kidney (parorchis of the male) ; N, posterior non-sexual portion of kidney. 



renal apparatus to the generative organs, the Gymnophiona in 

 all essential points resemble other Amphibia. 



The kidneys of Urodela and Anura are situated in the usual 

 position on the dorsal side of the body- cavity ; in the former they are 

 band-like and more extended longitudinally than in the latter^ 



A A 



