EVOLUTION OF ELEPHANTS 



315 



Recent 

 Pleistocene 

 Ufifier Pliocene 



ELEPHAS 

 (short chin) 



Lower Pliocene TETRABELODON 



[LONGIROSTRIS STAGE] 

 Ufiner Miocene (shortening chin) 



Middle Miocene TETRABELODON 



[ANGUSTIDENS STAGE] 

 Lower Miocene (long chin] 



~,- Mi oration from Africa 



I/finer Oh gocene . f _ A J 



' ' into Lurone -Asia 



Lower Oligocene?\ 

 UnnerEocene { 



Middle Eocene 



Lower Eocene 



PAL AEO MASTODON 

 chin) 



MOERITHERIUM 

 (short chin) 



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

 (From British Museum Guide.) 



