THE EEPRODUCTIVE ORGANS. 



341 



II. THE REPRODUCTIVE ORGANS. 



A. The male reproductive organs are the testes and their 

 ducts. 



a. General description. The relations of the testes have 

 ah'eady been given (p. 234) ; the organs vary much in shape 

 and size in different individuals and with the different seasons; 

 when greatest they are spherical^ or of a rounded oval form, occasion- 

 ally cone-shaped or pear-shaped. The surface of the testes is not 



Fig. 222. 



II. 



The male reproductive organs (enlarged). 



CC Vasa efferentia within the kidney. 



H Testis. 



LL Collecting-tube at inner border of kidney. 



N Kidney. 



Ne Vasa eflFerentia witliin the mesorohium. 



Ur Ureter. 



tt Vasa efferentia ending blindly. 



smooth, but presents a series of convexities, each corresponding 

 to a lobule of the gland. At the Jiilus on the inner border the vessels 

 pass to and from the organ, and the Fasa eferentia leave the testis. 

 The number of Vasa efferentia (Fig. 223 I and II) is subject "to 

 considerable variation, not only in different animals, but on the 

 two sides of the same animal. In some cases these ducts form a 

 network (I), in other cases this is absent (II) ; usually the ducts 



