112 



VERTEBRATA : MAMMALIA. 



FIG. 121. 



Elephant. 



weighing sixty to one hundred pounds each. The tusks 

 are simply the incisor teeth of the upper jaw enormously 

 developed and modified. Elephants of the present day 

 are confined to the warm regions of the Eastern hemi- 



O 



sphere. They are seven to ten feet high, and ten to 

 fifteen feet in length, and covered with thick, nearly 

 naked skin. One distinctive characteristic of these 

 animals is found in the grinders, the crown of which is 

 deeply divided into transverse vertical plates, each con- 

 sisting of dentine coated by enamel, and this by a bone- 

 like substance which fills the spaces between the plates 



