3§4 



SYSTEMATIC ZOOLOGY 



it is called in Europe. The family having bony horns covered 

 with a chitinous layer contains more species than any other 

 family of Ungulata. It includes the domestic cattle, the ox, Bos 

 tanrus, the sheep, Oris aries, the goat, Capra liircus, the African 

 gazelle, the Indian antelope, the chamois of the Alps and the 

 Pyrenees, the pronghorn antelope of the western United States, 

 remarkable for the deciduous outer sheath of its horns and for 

 its fleetness, — it is said to be the swiftest American game, — 

 the bison, the buffalo, and very many other species (Fig. 374). 



Suborder 3. Proboscidea 



The Proboscidea (Gr. irpofioaick, proboscis), or elephants (Fig. 

 375 ), are strikingly different in general external appearance from 

 the other Ungulata. They are provided with five digits on each 



1' " ' 3/5- Elephas inalcus, the Ablatio elephant. (From a photograph provided by the 

 American Museum ot Natural History.) 



foot, internally, but only three or four have external hoofs. The 

 body is covered with a loose, thick, wrinkled skin, sparsely cov- 

 ered with hairs ; the head is large and the snout greatly elon- 

 gated to form a muscular proboscis, at the tip of which are the 



