306 UNGULATA 
LT. 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. 
Dorcatheriwm+ 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 7 9, ¢4, p 3, m#% =34. Vertebre: C 7, 
D138, L 6,85, C 12-13. The only existing species, D. aquaticwm 
(Fig. 118), from the west coast of Africa, is rather larger than any 
Fic. 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. nani), only 
differing in size, occur in the lower Pliocene and Miocene of 
Europe ; fossil species are also found in the Indian Pliocene. 
In D. nawi 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 
» Kaup, Ossemens Fossiles de Darmstadt, pt. 5, p. 92 (1836). This name 
which was proposed for a fossil species, antedates Ayomoschus, Gray, applied to 
the living form. 
