44 



tyles] in tlie New; and geology has recently shewn that 

 tertiary species of Dicotyles existed in North as well as South 

 America. But no true Sus has been found fossil in either 

 division of the New World, nor has any Dicotyles been found 

 fossil in the Old World of the geographer. Phacochoerus 

 (Wart-hogs) is a genus of the Hog-tribe at present peculiar 

 to Africa. 



The Khinoceros is a genus now represented only in Asia 

 and Africa ; the species being distinct in the two continents. 

 The islands of Java and of Sumatra have each their peculiar 

 species ; that of the latter being two-horned, as all the African 

 Rhinoceroses are. Three or more species of two-horned Rhi- 

 noceros formerly inhabited Europe 1 , one of which we know to 

 have been warmly clad and adapted for a cold climate; but 

 no fossil remains of the genus have been met with save in the 

 Old World of the geographer. One of the earliest forms of 

 European Rhinoceros was devoid of the nasal weapon : it has 

 long been extinct. 



Geology has given a wider prospect of the range of the 

 Horse and Elephant, than was open to the student of living 

 species only. The existing Equidce, and Elephantidce, properly 

 belong, or are limited to, the Old World ; and. the Elephants 

 to Asia and Africa, the species of the two continents being 

 quite distinct. The horse, as Buffon remarked, carried terror 

 to the eye of the indigenous Americans, viewing the animal 

 for the first time, as it proudly bore their Spanish conqueror. 

 But species of Equus, like species of Mastodon, coexisted with 

 the Megatherium and Megalonyx in both South and North 

 America, and perished with them, apparently before the 

 human period. 



The third division of the GYRENCEPHALA enjoy a higher 

 degree of the sense of touch than the Ungulates through the 

 greater number and mobility of the digits and the smaller 

 extent to which they are covered by horny matter. This 

 substance forms a single plate, in the shape of a claw or nail, 



1 See my History of British Fossil Mammals, 8vo, p. 350. 



