UQP 



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

 Petromyzon. (After W. K. PARKER.) 333. Shark, $. 334. Chimasroid, juv. 9- 335- 

 Ceratodus. 336. Ganoid, 9- 337. Teleost (Salmonoid), 9. (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 



