EVOLUTION OF ELEPHANTS 



315 



Recent 

 Pleistocene 

 Ufifier Pliocene 



ELEPHAS 

 (short chin) 



Lower Pliocene TETRABELODON 



[LONGIROSTRIS STAGE] 

 Ufijier Miocene (shortening chin) 



Middle Miocene TETRABELODON 



fANCUSTIDENS STAGE] 



Lower Miocene ( long chin) 



T , , Migration from Africa 



UrmerOhqocene . J r 



into turone -Asia 



Lower Oligocene 

 UfijierEocene 

 MiddleEocene 

 Lower Eocene 



I 



\ PAL 

 J (le 



PAL AEO MASTODON 

 gthemng chin) 



MOERITHERIUM 



FIG. 159. Some Stages in the Evolution of the Skull in the Proboscidea 

 (From British Museum Guide.) 



