8 ELEPHANTS, EECENT AND EXTINCT. 



mastodons, portions of three may co-exist. In all 

 elephants, the more anterior of these six teeth are smaller 

 aucl of simpler structure than the hinder ones, and the 



whole series is protruded in an arc of a circle from back 

 to front, the larger hind teeth being pushed up and 

 gradually coming into use as the small anterior ones are 



