PISCES 



^35 



ing the liver the blood enters the sinus venosus by two hepatic 

 sinuses, closely apposed. 



Urinogenital System. — The dark red kidneys lie dorsal to the 

 vertebral column. Several tubes from each kidney combine to 

 form a ureter. The two ureters open into the urogenital sinus. 



— Testis 

 Epididymis 



Fig. 112. Urinogenital system of male skate. (Drawn by W. J. Moore.) 



whence the watery products pass out by the cloaca; in the female 

 they open into little bladders — the dilated ends of the Wolffian 

 ducts — and thence by a common aperture into the cloaca. 



Segmental ducts divide into Wolffian and Miillerian ducts. 

 The Wolffian duct becomes in the male the vas deferens; in t\icfe7nale 

 it is an unimportant Wolffian duct; the Miillerian duct becomes in 



