EVOLUTION OF ELEPHANTS 



315 



Recent 

 Pleistocene 

 Unner Pliocene 



ELEPHAS 

 (short chin) 



Lower Pliocene TETRABELODON 



[LONGIROSTRIS STAGE] 

 Unner Miocene (shortening chin) 



Middle Miocene TETRABELODON 



[ANGUSTIDENS STAGE] 

 Lower Miocene (tonjchm) 



Unner Oligocene 



into Europe -Asia 



Lower Oligocene'} 



|> PALAEOMASTODON 



Unner Eocene 



c] chin) 



M ,,, } MOERITHERIUM 



Middle Eocene \ 



7 (short chin) 



Lower Eocene > 



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

 (From British Museum Guide.) 



