306 



UNGULATA 



T. memmina. The first three are from the Malay Peninsula, or the 

 islands of the Indo-Malayan Archipelago, the last from Ceylon and 

 India. A fossil species occurs in the Pliocene of the latter country. 

 Dorcatherium l is distinguished chiefly by the feet being stouter 

 and shorter, the outer toes better developed, and the two middle 

 metacarpals not ankylosed together. Its dental formula (as that 

 of Tragulus) is usually i $, c ^, p f, m f = 34. Vertebrae : C 7, 

 D 13, L 6, S 5, C 12-13. The only existing species, D. aquaticum 

 (Fig. 118), from the west coast of Africa, is rather larger than any 



Fio. 118. The African Water-Chevrotain (Dorcatherium aquaticum). 



of the Asiatic Chevrotains, which it otherwise much resembles, but 

 it is said to frequent the banks of streams, and have much the 

 habits of Pigs. It is of a rich brown colour, with back and sides 

 spotted and striped with white. It is evidently the survivor of a 

 very ancient form, as remains of the type species (D. naui), only 

 differing in size, occur in the lower Pliocene and Miocene of 

 Europe ; fossil species are also found in the Indian Pliocene. 

 In D. naui there are, at least frequently, four lower premolars, 

 while the existing species has but three of these teeth. 



Extinct Traguloids. A number of small selenodont Artiodactyles 



1 Kaup, Ossemens Fossiles de Darmstadt, pt. 5, p. 92 (1836). This name, 

 which was proposed for a fossil species, antedates Hyomoschus, Gray, applied to 

 the living form. 



