ANATOMY OF PIGS 



275 



can and does attack and destroy human beings. The Hippo- 

 potamus not only swims, but can walk along the bottom of a 

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

 the mouths of rivers frequented by it ; and it is supposed that in 

 this way Madagascar was populated with Hippopotamuses, whose 

 remains are now found in swamps in that island. 



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

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

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

 generally hairy, but the Babyroussa is an exception, while Phaco- 



fOlVjJjf - 



Fig. 141. — Wild Boar. Sus serofa. 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 caecum. The kidneys are smooth, and the liver is more 

 lobate than in I[i]J2^opotamus. The orbital 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 described, but Dr. Forsyth 



'- There is, however, some doubt about the first premolars. 



