333 



334 



UGS 



AP 



AP 



335 



336 



UGS 



337 



/ \ us 



f *r% 



UGP 



AP 



Figs. 332-337. Urinogenital ducts and their external openings. 332. Cyclostome, 

 Pctromyzon. (After W. K. PARKER.) 333. Shark, ?. 334. Chimaeroid, juv. 9. 335. 

 Cerahdus. 336. Ganoid, $. 337- Teleost (Salmonoid), ?. (After BOAS.) 



A. Anus. AP. Abdominal pore. CL. Cloaca. G. Genital opening. MD, MD' . 

 Left and right Miillerian ducts. OVD, OVD'. Left and right oviducts (not Miillerian 

 ducts). R. Rectum. U, U' . Left and right ureters. UG. Urinogenital opening. UG' ', 

 UG". Left and right Urinogenital ducts. UGP. Urinogenital papilla, showing distal 

 opening. UGS. Urinogenital sinus. UP. Urinary papilla. 



267 



