ANATOMY OF PKIS 275 



can and does attack and destroy liunian lieings. The Hippo- 

 potamns not only swims, l)ut can walk along the bottom of a 

 river with great rapidity. It occasionally puts out to sea from 

 the mouths of riyers frecpiented by it ; and it is supposed that in 

 this way Madagascar was populated with Hippopotamuses, whose 

 remains are now found in swani})s in that island. 



Fam, 2. Suidae. — Tlie Pig family, Suidae, differ from the last 

 in their smaller size, in the terminal nostrils and mobile snout, 

 which is not grooved, except faintly as in Bahirvfia. They are 

 generally liairy, but the Babyroussa is an exception, whih' riiaco- 



FiG. 141. — Wild Boar. Si/s scrofa. x ^V. 



choerus is but slightly haired. Though there are four digits, as 

 in the Hippopotamus, only two reach the ground in walking. 

 The stomach, furthermore, is simple, and (except in Dicotyles) there 

 is a caeciim. The kidneys are smooth, and the liver is more 

 lobate than in Hijrpopotamvs. The orljital cavity is confluent 

 with the temporal fossa. The typical genus, Sus, is distributed 

 over Europe, Asia, and the islands of the Malay Archipelago, 

 reaching as far as Borneo and Celebes. The dentition ^ is 

 complete. A single species, the so-called S. sennaariensis, is 

 from Ethiopian Africa, but it is not certain how far this animal 

 may be an escaped species introduced by man. A very large 

 number of " species " of Sus have been descril)ed, but Dr. Forsyth 



1 There is, liowever, some (loul)t about the first premolars. 



