534 



MU. 11. I. POCOCK ON THE EXTERNAL 



depression between them on the upper side is tolerably deep ; 

 they can be sepsirated to a considerable extent, and their distal 

 ends carrying the hoofs are free. The hoofs are small and 

 bluntly pointed, and there is no clear line of demarcation 

 laterally between their edges and' the area of flat horny integu- 

 ment constituting the sole of the toe. 



The lateral digits are much smaller, are free from webbing, and 

 the small hoofs encircle their tips. 



The sole of the foot is covered with naked wrinkled skin. On 

 the area between the plantar pad and the edge of the webbing 

 uniting the two larger digits there is a shallow depression which 

 may be glandular, ))ut J. was unable to investigate its nature by 

 sections. The plantar pad is irregularly heart-shaped, being 

 narrow and more or less truncated in front, where it stands up as 



Text-fiffure 33. 



A. Eav of diccropsis Uheriensis. 

 13 & C. Dorsal nnd lateral views oftlie tail of tlie snnu 



a well-defined horny cushion, and widely rounded behind, where 

 it is ill-defined and gradually blends with the integument above 

 or behind it. (Text-figs. 30-32.) 



There is no marked difference in size or structure between 

 the fore and hind foot, except that in the latter the two 

 smaller digits are alike in size, whereas in tlie formei- the 

 outer digit is considerably thicker and larger than the inner. 

 This is the only particular in which there is distinct asym- 

 metry in the feet. 



The feet of living examples of Hippopotamus amphihius 

 that I have seen differ from those of Chosropsis liberiensis in 

 being much more compactly built. There is no great difterence 

 in size between the four digits, and since they are much more 

 closely united by integument, the feet are incapable of the 



