496 • 



DE, P. CHALMEES MITCHELL ON THE 



suggesting the possible former existence of a colic loop. The anterior mesenteric 

 vein runs nearly diametrically across the Meckelian mesentery, receiving the usual 

 tributaries from the loops of Meckel's tract, and, near the dorsal edge of the mesentery, 

 is joined by a posterior mesenteric vessel. 



Fig. 34. 



Intestinal Tract of Ursus malayanus. 



Lettering as in fig. 32. 

 C.L. Colic loop. 



Family Pkoctonid^. Bassaris astuta, Nasua vitiata, Procyon lotor, Cercoleptes 



caudivolvulus (fig. 33, p. 495). 



In this group there is not much difference from the characters shown by the intestinal 



tract of the Mustelidae. The duodenal loop is generally rather better separated. 



Meckel's tract is almost similar in character. There is no trace of a ctecum, and, as 



