“ln, fw et 
A AP 
Figs. .— Urinogenital ducts and their external openings. 332. Cyclostome, 
Petromyzon, (After W. K. PARKER.) 333. Shark, 9. oo Chimeeroid, juv. 2. 335. 
Ceratodus. 336. Ganoid, 2. 337. Teleost (Salmonoid), 2. (After BOAs.) 
A, Anus. AP. Abdominal pore. CZ. Cloaca. G. Genital opening. MD, MD’. 
Left and right Miillerian ducts. OVD, OVD’. Left and right oviducts (not Miillerian 
ducts). #. Rectum. U, U’. Left and right ureters. UG. Urinogenital opening. UG’, 
UG". Left and right urinogenital ducts. UG/P. Urinogenital papilla, showing distal 
opening. UGS. Urinogenital sinus. UP. Urinary papilla, 
267 
