EVIDENCES FROM PALAEONTOLOGY 77 
North America, Europe and Asia; Stegodon from the Pliocene of 
southern Asia; and Elephas from the Pleistocene of the Americas, 
Europe, and Asia, as well as the living elephants of Asia and Africa. 
Fic. 5.—Evolution of head and molar teeth of mastodons and elephants. 
A, A’, Elephas, Pleistocene; B, Stegodon, Pliocene; C, C’, Mastodon, Pleistocene; 
D, D’', Trilophodon, Miocene; E, E’', Palaeomastodon, Oligocene; F, F’, Moe- 
ritherium, Eocene. (From Lull.) 
