333 



MD 



334 



U 



AP 



UGS 



335 



AP 



M 



336 



UGS 



OVD 



337 



UGP 



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

 Petromyzon, (After W. K. PARKER.) 333. Shark, J. 334. Chimseroid, juv. 9 . 335. 

 Ceratodiis. 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). K. 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 



