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Show 1873.J OF THE 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; py, 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 circumference of 6 inches, reaching 7 inches in the duodenum. For the first six inches after the pylorus the mucous membrane is smooth and simple, m u c h like that in the pyloric portion of the stomach. The seventh and eighth inches present irregular folds, which immediately 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 P R O C . Z O O L . S o c - 1 8 7 3 , No. VII. 7 |