U58 MR. W. H. FLOWER ON HYOMOSCHUS AQUATICTJS. [DeC. 12, 



except one natural rectangular bend upwards near the pyloric end. 

 The length of this compartment when straightened is 7 inches, its 

 greatest diameter 2^ inches. 



Fio;. 2. 



Anterior surface of stomach of Hyomosckut: aquafivug. One-fourth of nat. size. 



a. (Esophagus, b, Kumen. c. Reticulum, d. Rudiment of psalterium. 

 e. Abomasus. /. Biliary duct. g. Spleen. 



On opening the cavities the villi on the internal surface of the 

 rumen were seen to be long and narrow, especially towards the base 

 of the compartment ; they measured mostly -f-^ inch in length. In 

 the reticulum the villi are very sharp-pointed, as usual. The passage 

 along the top of the reticulum from the oesophagus to the orifice 

 leading to the true stomach is smooth, ^ inch long, and bounded by 

 thick but not very prominent folds of membrane. This orifice is 

 5 inch in diameter. The part which immediately follows the ori- 

 fice (</), though it cannot be called a distinct compartment as in 

 ordinary ruminants, is ^ inch in length, slightly dilated and marked 

 off by a faint constriction from the remainder of the abomasus, from 

 which, moreover, it is most distinctly separated by a thick opaque 

 epithelium with short viUi, like those covering the laminae of the 

 psalterium in other ruminants ; there are also indications of longi- 

 tudinal plications of the mucous membrane. The remainder of the 

 last cavity has (as usual) a smooth soft lining membrane, free from 

 viUi. 



There is thus a decided indication or rudimentary condition of 

 the psalterium or third compartment of the ruminant's stomach ; 

 and contrasting this with the statement by Alph. Milne-Edwards, in 

 his valuable monograph on the Chevrotain.s, that in the genus Tra- 



