736 ON THE VISCERA Ol*' A WALRUS. [June 15, 



a capacious duct." Tlie pancreatic duct enters the intestinal wall 

 ujjon its concave as^^ect 1 cm. below tlie bile duct ; it passes, 

 within the substance of the wall, diagonally downwards towards 

 the convex border of the gut suj^erficial to the bile duct and opens 

 into the elongated chamber upon a prominent papilla, just to the 

 colic side of the opening of the bile duct. 



The I'elative size of the elongated chamber find its coai'se 

 structure and apj^earance agree in every respect Avith Murie's 

 desci'iption. It may be mentioned, however, that the papilla 

 on which it opens is circumvallate, being surrounded by a sharp 

 circular fold of mucous membrane. 



Sections through the bile duct, elongated chamber, and intestine 

 show that in minute sti'ucture the elongated chamber resembles 

 the intestine rather than the bile duct ; and there is little doubt, 

 both on this ground and fi'om the mode of entry into it of both 

 the bile and pancreatic ducts, that this chamber is really a diver- 

 ticulum of the intestine and not a dilated part of the bile duct. 



The Sea-Lion, from Murie's description and figure *, has a 

 similar intra-mural bile receptacle ; but I do not know of its 

 occurrence elsewhere except in the Chelonia, especially Dermo- 

 chelys, and, as I am told by Mr, Beddard, in the Edentate 

 Myrmecophaga. 



The stomach. 



The curious U-slmped superficial appearance of the stomach 

 has been already fully described, but at present there is no 

 record of the histological sti'ucture. 



Sections taken at three points, (1) close to the entry of the 

 oesophagus, (2) in the middle of the U-shaped curve, (3) an inch 

 from the pylorus, show that the histological structure agrees 

 fairly well with that of the stomach of Otariaf. In localities 

 1 & 2 the submucosa was occupied by a number of peptic glands 

 arranged in bundles separated fi'om neighbouring bundles by 

 connective tissue. In locality 1 the glands wei-e only slightly 

 more than half as long as in locality 2, but had very much the 

 same structure, the parietal cells being very luimerous in both. 

 In locality 2 the deep ends of the gland tubes were inclined to 

 be contorted. In locality 3 the glands were pyloric, and were 

 large and much contorted, more so apparently than in either the 

 Sea- Lion or the Seal. Their tei'minal parts formed a series of 

 large lobules in the deeper pai-ts of the submucosa, separated from 

 each other by connective tissue, but near enough to one another 

 to constitute an approximately continuous layer. 



* Muvie, Trans. Zool. Soc. vol. viii. p. 565. 



t Pilliet, C. R. Soc. Biol. ser. 10, t. i. 1894, p. 743. 



