INTESTINAL TEACT OF MAMMALS. 



475 



very long, forming, in most cases, a very regular series of closely-packed minor loops at 

 the periphery of the usual semicircular expanse of mesentery. On the whole, these 

 coils are more regular and more closely packed in the Cervidse and Giraffidae than in 

 the Bovidae, but I doubt if there is enough distinction between the groups to lay any 

 stress upon it. The caecum is long, but varies from genus to genus. The hind-gut 

 always displays the three regions to which I have called attention in describing 

 Tragulus and Camelas ; but besides this there is sometimes an additional minor 

 loop between the caecum and the spiral coil, which I term the postcaval loop 



Fig. 22. 



Intestinal Tract of Giraffa camelopardalis. 

 S. Cut. end of duodenum near stomach. 

 E. Cut end of rectum near anus. 

 C. Caecum. 

 r.C'.L. Postcaval loop of hind-gut. 

 S.P. Spiral loop of hind-gut. 

 S.F. Supra-Meckelian fold. 

 X, X. Cut onds of posterior mesenteric vein. 

 X2, Xl». Cut ends of vein from spiral loop. 



(fig. 22, P.C'.L.) and which is well marked in the Giraffe and some Deer, but not so 

 distinct in the Bovidse. The spiral loop is always long and flatly coiled in a number 



