194 



THE FROG 



iirinogenital duct. On the outer side of the ureter, and com- 

 municating 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 fluid. 



The spermary itself contains a narrow, irregular, central 

 cavity, from which the efferent ducts proceed and into 

 which open a number of short tubes or crvp/s (Fig. 62, A). 



Fig. 6r. — .Spermary and kidii'j\ o( frcg showing the relations of the olTerent ducts 

 (semidiagraminatic). 

 C. transverse tubes in kidiiey ; /-/o. spermary; L. longitudinal tube; jV. kidney: 

 ^. eflerent ducts of spermary ; i>. ureter (urinogenital duct). (From W'ieder- 

 slreiiu's ^I'latomy.) 



These are lined with epithelium (/. <'), the cells of which 

 divide and subdi\ ide, forming groups of smaller cells. Each 

 of the latter undergoes a remarkable change, becoming con- 

 verted 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 spermatozoa (Fig. 62, 'A, sp, and B)'; in spite of 



