1872.] 



ANATOMY OF THE HIPPOPOTAMUS. 



193 



underlies a portion of C. Daubenton's specimen (so far as one can 

 understand his figure at all) resembled mine, except that the last 

 division was much smaller in proportion. 



Daubenton makes no mention of the erescentic folds in D ; neither 

 does Dr. Crisp. Disappearance with age might account for Dr. 

 Crisp not finding them ; but Daubenton's specimen was foetal. 



I am unable to offer any reason for this very strange alteration of 



arrangement. 



I can only state what I have observed. 



Stomach of Hippopotamus, after Gratiolet, ' Recherches sin* l'Anatomie de 

 l'Hippopotame,' pi. ix. fig. 4. ■ 

 The letters denote the same parts as in the preceding figures. 



Intestines. — They measured 49 feet from the pylorus to the anus. 

 On opening the abdomen the small intestines were alone visible. 

 The colon lay beneath them, and was not disposed in spiral folds as 

 it is in some Pachyderms. The small intestines are thickly beset 



with very fine silky villi, 



There is no caecum, and no 



marked division into small and large intestine ; but at about 3' 6" 

 from the anus the villi suddenlv cease, and the tube dilates consi- 

 derably. At this part, for about 4" in length, the mucous mem- 

 brane is puckered into longitudinal folds, which are occasionally 

 crossed by other folds transversely, so as to enclose a numher of 

 spaces of irregular size and shape. The floor of these spaces is again 

 subdivided in a similar manner by fresh reduplications of the mem- 

 brane, producing hollows of the most varied form (some large and 

 some small), so as to give in places, where the size does not exceed 

 that of a small pin's head, an appearance not unlike the orifices of 

 glands. The whole arrangement may, to a certain extent, be com- 

 pared to the reticulations of the membrane of the intestines of certain 

 Proc. Zooi.. Soc— 1872, No. XIII. 



