GENITAL ORGANS 



471 



is either pointed at one or both ends (Fig. 342), or more or less 

 round or oval (Fig. 343, 355). 



In Rana (Fig. 355), Bombinator, and Alytes, the vasa efferentia 

 of the testis gradually become more separated from the kidney. 

 In Rana temporaria, the efferent ducts are connected with a 

 longitudinal canal, from which the sperms pass through the 

 so-called ampulla? (i.e. Malpighian capsules which have lost their 

 glomeruli) and the transverse canals to the urinogenital duct : in 

 Rana esculenta the efferent ducts open directly into the urino- 



htts 



FIG. 3.54. DIAGRAM OF A PORTION OF THE MALE GENERATIVE APPARATUS IN 



THE GYMNOPHIONA. 



Ho, testis : 7/X, urinogeiiital duct ; K, testicular capsules ; M, Malpighian 

 capsules ; X, kidney ; Q, transverse canals connecting the collecting duct 

 with the longitudinal canal (L, L) ; Q l y second series of transverse canals ; 

 >'. convoluted portion of urinary tubule ; Sg, collecting duct of testis ; 

 ST, nephrostome. 



genital duct, without becoming connected with the urinary 

 tubules, while in Bombinator the greater number of the posterior 

 canals end blindly, only the anterior ones being directly connected 

 with the urinogenital duct. 1 



* Miillerian ducts are always present in a more or less ves- 

 tigial condition in the male, and lie along the outer border of 

 the kidneys in a similar position to those of the female. They 

 may or may not be provided with a lumen and apertures of com- 



1 In Alytes the relations of the generative ducts require further investigation : 

 the efferent ducts at the anterior end of the kidney are said to open into the 

 persistent Miillerian duct. 



