1873.J 



OF THK SUMATRAN RHINOCEROS. 



97 



membrane of the ordinary colour. The line of junction of these two 

 portions is abrupt ; and its position can be best understood from the 

 accompanying drawing, in which it is seen that the corrugated white 

 opaque epithelium only covers about one fourth of the whole cavity — 

 namely, the margins of the oesophagus for about an inch, and the 

 diverticulum, from which it extends to the right, and backwards for 

 a short distance. The walls of the stomach are nearly uniform in 



Fig. 3. 



Stomach of C. sumatrensis (inner surface). 

 ces, oesophagus ; pi/, pylorus ; cc, cardiac cul-de-sac. 



thickness, being a little more muscular at the cardiac extremity and 

 along the lesser curvature than elsewhere. When the organ is fully 

 distended the diverticulum becomes less conspicuous, the direction of 

 its superficial fibres being from its base to its apex. The pyloric 

 muscular ring is strong and nearly an inch thick, projecting into 

 the tube. 



The small intestine is 36 ft. long, and of a nearly uniform circum- 

 ference of 6 inches, reaching 7 inches in the duodenum. For the 

 first six inches after the pylorus the mucous membrane is smooth 

 and simple, much like that in the pyloric portion of the stomach. 

 The seventh and eighth inches present irregular folds, which imme- 

 diately give place to a perfectly uniform series of thin, continuous 

 (or nearly continuous), transverse foldings, just like the valvulae 

 conniventes of the human small intestine. There are nineteen of 

 these folds in each six inches of the intestine ; and they continue 



Proc. Zool. Soc— 1873, No. VII. 7 



