Recent 

 Pleistocene 

 Upper Pliocene 



ANCESTRY OF ELEPHANTS. 



Fig. 4. 



ELEPHA5 

 (short chin) 



Lower Pliocene TETRABELODON 



[LONGIROSTRJS STAGE] 

 Ufijier Miocene (shortening chin) 



Middle Miocene TETRABELODON 



[ANGUSTIDENS STAGE] 

 Lower Mio cene ( long chin) 



Upper OUgocene fron, Africa 



into Europe -Asia 



Lower Oligoce ne ?\ 



\ PAL AEO MASTODON 

 UpnerEocene \ (^^enwg chin) 



Middle Eocene 



Lower Eocene 



MOERITHERIUM 

 (short chin) 



Diagram showing some stages in the gradual increase in size, and alteration 

 in form of the skull and mandible, occurring in the Proboscidea from 

 the Eocene to the present day. 



