THE EVOLUTION OF THE ELEPHANT 



F F- 



Fig. 4. — Evolution of head and molar teeth of masto- 

 dons and elephants. A, A', Elephas, Pleistocene; B, 

 Stegodon, Pliocene; C, C, Mastodon, Pleistocene; D. D', 

 Trilophodon, Miocene ; E. E', Palaeomastodon, Oligocene ; 

 F, F', Moeritherium, Eocene. (After Lull.) 



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