AJSTATOMY OF THE SO^'DAIC EHINOCEEOS. 193 



bowel showed a globulax distension (d), the transverse diameter of which measured 

 18 inches. 



The transverse and descending parts of the colon were less sacculated than the rest of 

 the large intestine ; they presented two muscular bands, which were continued from 

 the two met with on the top of the colon. Upon the inferior aspect of the transverse 

 colon at its commencement was a distinct muscular band, 24 inches in length, that 

 was placed in the long axis of the bowel ; it caused no sacculation. The whole length 

 of the colon from the ending of the loop to the anus was 6| feet. The width of this 

 part of the bowel was, at its \ipper part, 10 inches; but as the anus was approached, 

 the diameter diminished to 7 inches. The lesser or inferior mesenteric artery entered 

 the bowel 3 feet from the anus. 



The length of the bowel from the ileo-csecal valve to the anus was 14^ feet, a shorter 

 measurement than those given for corresponding parts of the colon in the Indian and 

 Sumatran Rhinoceroses. 



The ileum (<S'./) entered the ctecum obliquely and in a line with the long axis of the 

 outgoing limb of the loop. The ileo-csecal junction was entirely hidden by the 

 adhesions (normal) that bound the base of the csecum to the commencement of the 

 transverse colon. 



From that margin of the ileum that was most remote from the attachment of the 

 mesentery, a large triangular fold of peritoneum (p) passed to the inferior surface of 

 the caecum (PI. XXXTV. fig. 2). It represents the ileo-csecal plica, and contained no 

 visible blood-vessels. 



Immediately in front of the ileo-csecal junction the peritoneum was so arranged as to 

 form a large rounded fossa (PL XXXIV. fig. 2, f) capable of engaging the entire fist, 

 and surrounded by a very distinct margin. This fossa was not rendered evident until 

 after the adhesions at the base of the caecum already alluded to had been broken down. 

 This pouch corresponded to the fossa ileo-csecalis superior, met with in Man and in a 

 large number of the Mammalia, and around its anterior margin ran a blood-vessel 

 corresponding to the " artery of the arch of the csecum " (4, fig. 2, PL XXXIV.) which 

 Chauveau met with in the Horse. 



The csecum and the colic loop were entirely invested by peritoneum. The limbs of 

 the loop were connected together by a simple layer of serous membrane, as in the 

 Horse. The base of the csecum and the roots of the colic loop were devoid of 

 peritoneum and were closely adherent to the parietes. The transverse and descending 

 parts of the colon were provided with an extensive meso-colon, which was attached in a 

 vertical line along the front of the vertebral column. 



The duodenum, which at its commencement was provided with a meso-duodenum, 

 passed transversely from right to left behind the base of the csecum. The com- 

 mencement of the small intestine was consequently to the left of the caput coli. The 

 portion of duodenum behind the csecum was devoid of peritoneum and was in contact 



2p2 



