THE ELEPHANT. 
numerous large air-cells (Fig. 307). Another remarkable 
feature, from which the group takes its name, is the trunk 
or proboscis, a long, thick, fleshy, flexible snout, growing 
from the front edge of the nasal bones (Fig. 307, a). The 
trunk ends in a finger-like, highly sensitive point, below 
which are situated the nostrils. The brain has a large 
cerebrum, with numerous convolutions, but more of the 
Fia. 308.— The hairy Mammoth. From NordensMold. 
cerebellum is exposed than in any of the succeeding orders; 
in this respect and in the large incisors the Proboscidians 
approach the Rodentia. 
In the nature of the limbs, especially from the fact that 
elephants walk on their toes, a relation to the Ungulates is 
indicated. They are five-toed, but the digits are repre- 
sented externally only by the five broad, shallow hoofs, the 
