474 



DR. P. CHALMERS MITCHELL ON THE 



joins the main vein about the middle of the course, running across the semicircular 

 expanse of mesentery. The rectal or posterior mesenteric vein, represented as cut 

 across at X and X, receives the factors which drain the spiral coil and enters the 

 anterior mesenteric vein close to the duodenum. 



In the Guanaco the pattern can hardly be distinguished from that of the Camel. 

 The CEecum is relatively much shorter, and the spiral coil is rather longer and less 

 tightly coiled. 



Sub-Order PECORA. 

 Family CEEViDiE. Cervus axis and many others. 



Family Bovine. Ovis tragelaphus (fig. 21), Gazella dorcas, and many others. 

 Family Giraffid^e. Giraffa camelojpardalis (fig. 22). 

 Taking advantage of the material at the Gardens, I have examined a large number 

 of Deer, Sheep, Cattle, Goats, Antelopes, and one specimen of Giraffe, and have found 



Fig. 21. 



Intestinal Tract of Ovis tragelaphus. 

 Lettering as in fig. 19. 



a remarkable uniformity in the very elaborate patterns displayed by these specialised 

 animals. The duodenum is a well-marked loop in the Giraffe (fig. 22) and in the 

 Cervidae ; it is less well separated in the Bovidse (fig. 21). Meckel's tract is in all 



