THE SKATE. 



55 



TIG. 18. Raja batis. The urinogenital organs of the male (one- 

 third nat. size). 



The organs are supposed to be removed from the body along with a 

 small portion of the oesophagus (a~s), and viewed from the ventral aspect : 

 the right testis (/) is removed, along with the corresponding epididymis 

 (epd) and all bu^ the posterior extremity of the vas deferens (v.d), 

 which, with the sperm sac (s.s) is turned outwards to display the 

 ureters (ter) : the cloaca (<:/), the urinogenital sinus (ug.s), and the 

 right vesicula seminalis (v.s) and sperm sac (s.s) are laid open. 



a.p, abdominal pore : ct, cloaca : epd, epididymis : i.r, inter-renal 

 body : k, kidney : as, oesophagus : pn.d, pronephric duct : s.s, sperm 

 sac : s.s', its opening into the urinogenital sinus : /, testis : Hg.p, urino- 

 ge.iital papilla: ug.s, urinogenital sinus: ^lr, ureter: ur 1 , its opening 

 into the urinogenital sinus: v.d, vas deferens : v.s t vesicula seminalis : 

 v.s', its opening into the sperm sac. 



