104 THE FROG CHAP. 



therefore often called the urinogenital duct. On the 

 outer side of the ureter, and communicating with it by 

 numerous short ducts, is a glandular body, the seminal 

 vesicle (Figs. 3 and 7, vs.sm), which serves to store up. 

 the spermatic substance. 



The spermary itself contains a narrow, irregular, 

 central cavity, from which the efferent ducts proceed 



FK;. 61. Spermary and kidney of "edible Frog" showing the relations of the 



efferent ducts (x about 3 ; scmidiagrammatir). 



C, transverse tubes in kidney ; Ho. spermary; L. longitudinal tube; N. kidney; 

 q. efferent ducts of spermary; Ur. ureter (urinogenital duct). (From 

 Wiedersheim's Comp. Anatomy.) 



and into which open a number of short tubes or crypts 

 (Fig. 62, A). These are lined with epithelium (t.'e), the 

 cells of which divide and subdivide, forming groups of 

 smaller cells. Each of the latter undergoes a remark- 

 able change, becoming converted into a rod-like body, 

 produced into a long thread, which performs lashing 

 movements, very much like those of the cilia in ciliated 

 epithelium. These bodies are called sperms or sperma- 



