INTESTINAL TRACT OF MAMMALS. 



203 



The proximal portion of Meckel's tract, as is usually the case 

 in mammals, is sub-divided into a number of closely-set irregular 

 loops. Then follows the large caecal pouch, assumed by most 

 authors to be the representative of the normal mammalian 

 caecum, but which I regard as peculiar to Hyrax (text-fig. 12, 

 A.C.). The gut as it leaves this is much expanded and closely 

 adherent to the wall of the caecum. It then runs a nearly 



Text-figure 12. 



Ci. 'Cx. 



Intestinal tract of Dendroliyrax dorsalis. 



S. Cut end nearest the stomach. R. Cut end nearest anus. A.C. Accessor}' or 

 median cfBCum. C. 1, C.2. Paired cseca. C. 3. Fourth ca2cum. C.L. 2. Colic 

 loop {ansa coll sinistra). XX. Severed ends of rectal vein. The portion of 

 the recto-colic mesenterj' edged with a broken line is where the mesentery was 

 cut ; the more proximal portion edged with an unbroken line was free from the 

 dorsal bodj'-wall. 



straight course parallel with the long axis of the caecum, to 

 which it is bound by a fold of mesentery, and bearing on its 

 morphologically ventral or larger curvature a much smaller 

 csecal pouch (text-fig. 12, 0. 3), noted by Lonsky (Lonsky, 1903) 

 and confirmed by Beddai-d, and now by myself as present in 

 Dendrohyrax, absent in H. capensis. The tract now passes up- 

 wards towards the dorsal middle line, forming what I take to be 



