1909.] VISCERA OF A WALRUS. 737 



dorsal wall. The clitoris also is of great size, forming a large 

 twisted prominence upon the ventral surface of the urogenital 

 sinus and terminating in a swollen trifid glans that projects freely 

 from the upper part of a deep preputial recess (text-fig. 232, 

 p. 735). 



The ovary, like that of the Seal and Sea-Lion, lies in a 

 voluminous ovarian sac which communicates with the body-cavity 

 by a small .aperture upon the dorsal aspect opposite the uterine 

 extremity of the ovary (text-fig. 233). The Fallopian tube is 

 short and, so far as could be seen, straight, and opens into the 

 ovarian sac by a crescentic aperture situated upon the roof of the 

 ovarian sac j ust to the anterior side of its opening into the body- 

 cavity. From the posterior lip of the Fallopian funnel a series 

 of parallel ridges (fimbriae) pass forward along the roof of the 

 ovarian sac close to the line of attachment of the ovary. In the 

 small size of the opening of the ovarian sac the Walrus more 

 nearly resembles Otaria than Phoca. 



The bile and pancreatic ducts. 



Murie in his desciiption of the bile duct and alimentary canal 

 (I. G. p. 429) describes a curious and very extensive (5| in. long) 

 dilatation of the common bile duct within the walls of the 

 intestine between its point of contact with the gut wall and its 



Text-fig. 234. 



Bile and jiaDcreatic ducts and their mode of entry into the intestinal 

 cul-de-sac. 



S.D. Bile duct. C. Fold encircling the papilla hy which I.C., the intestinal cul- 

 de-sac, opens into the cavity of the intestine, J. P.D. Pancreatic duct. 



communication with the intestinal cavity. The preparation made 

 from this present individual in most respects fully bears out 

 Murie's description, but to it should be added the mode of entry 

 of the pancreatic duct ; and I wish also, upon the suggestion 

 of Prof. Keith, to put forward another interpretation of the 

 nature of the dilatation of the bile duct within the intestinal 

 wall. 



The bile duct enters the intestine at a very acute angle close to 

 the beginning of the duodenum. After i-unning for 3 cm. without 

 change within the substance of the wall, it opens suddenly by 

 a well-defined circvdar aperture through the side wall of the 

 elongated chamber described by Murie as the terminal part of 

 the duct. This is not quite the same thing as " enlarging into 



Proc. ZooL. Soc— 1909, No. L. 50 



