. 
80 NATURAL HISTORY. 
CHAPTER VIII. 
THICK-SKINNED QUADRUPEDS. 
135. WE now come to the second division of Quadru- 
peds, the Ungulata or hoofed quadrupeds. Of this there 
are two orders: 1. The Pachydermata, or thick-skinned. 
2. The Ruminantia, ruminating, or cud-chewing. The 
Pachydermata are variously classified by different natu- 
ralists. I make six families: 1. The Elephants. 2. The 
Tapirs. 3. The Pig Family. 4. The Rhinoceros Family. 
5. The Hippopotamus Family. 6. The Horse Family. 
136. Of the Elephants there are only two species, the 
Asiatic and the African, the latter of which you see in 
Fig. 68. The Elephant has several hoofs arranged in a 
Fig. 68.—The Elephant. 
circular manner around the bottom of the foot. His 
trunk or proboscis (from which this family is sometimes 
