HYRAXES, ELEPHANTS, AND UNGULATES 287 



about seventy-one genera which are referred to thirteen 

 families. Some of these families, however, have only one 

 or two species at present existing to represent them, and the 

 great mass of Ungulates, taking them as a whole, belong to 

 the Ox-family, Bovidtv, which contains about 200 species. 



Section IV. — Distribution of Rhinoceroses 



We will begin the Ungulates with what is called by 

 naturalists the Perissodactyle section, which, although 

 abundant in former ages, is represented in the present state 

 of the earth's fauna only by three distinct types forming 

 so many families, the Rhinoceroses, the Tapirs, and the 

 Horses. In each of these families there remain a few 

 species only, the relics of a vast number of ancestors 

 which have preceded them. 



Of the existing Rhinocerotidze only five well-ascertained 

 forms are known, two of which belong to Africa and three 

 to India, although many other species have been suggested 

 upon more or less sufficient evidence. The Rhinoceroses 

 of the Ethiopian Region belong to quite a distinct section 

 of the genus from the Oriental form. These two animals 

 commonly, though not very correctly, called the " Black " 

 and " White " Rhinoceroses, are best distinguished by the 

 shape of the upper lip, which in the " Black " Rhinoceros 

 is long, pointed, and extensile, and in the "White" 

 Rhinoceros is short, square, and truncated. The Short- 

 lipped Rhinoceros {Rhinoceros simus), now nearly extinct, 

 has never been met with north of the Zambesi River, which 

 forms the northern boundary of many of the peculiar 

 mammals of the Cape district. On the other hand, the 



