236 



PISCES 



the/emale the oviduct, in the male it is a mere rudiment. The body- 

 cavity rids itself of waste through the abdominal pores. '^ 



In the male, the anterior portion of the kidney persists as the 

 epididymis, and its duct becomes the spermiduct. The posterior 

 portion, the functional kidney, has its own duct, the ureter. In the 

 female no direct connection exists between the reproductive and 

 renal organs in the anterior portion. The ureters open in males 

 into a median chamber — the urino-genital sinus — which also re- 



OsNum 

 — Esophagus 



-Oviduct 



—Mesonephric duct 

 -Ovary 



-j — S/?e// gland 



Uterine portion 

 of the oviduct 



Kidney 

 ^Ureters 



Urinary bloddei^ 

 Urinary papilla 



Cloaca 



Opening of cloaca^ 

 ■Abdominal Pore 



Fig. 113. Urlnogenital system of female skate. (Drawn by W. J. Moore.) 



ceives the spermiducts. This communicates with the cloaca by a 

 median opening on a papilla — the urino-genital papilla. There is a 

 median urinary sinus in females. The ureters open into the sinus 

 or directly into the cloaca. The testes are fastened by a fold of 

 peritoneum on each side of the cardinal sinus. (Figure 112.) 

 Spermatozoa pass from the testes by the vasa efferentia into a tube 



* Smith et al. have shown that the perivisceral fluid escapes through the abdominal 

 pores. They also emphasize the secretory capacity of the pericardium and peritoneum 

 in Elasmobranchii. (Smith, H., 1929, J. Biol. Chem., vol. 81, no. 2.) 



