EVOLUTION OF THE HORSE AND THE ELEPHANT 427 



From Lull's "Evolution of the Elephant " 



FIG. 200. Evolution of the group of elephants, e, Moerilherium (middle Eocene 

 of Egypt); d, Palceomastodon (upper Eocene of Egypt); c, Trllophodon (or 

 Tetrabelodori) angustidens (Miocene) ; 6, Mastodon (or Mammuf) americanus 

 (Pleistocene) ; a, Elephas columbi, the Columbian Mammoth (Pleistocene), related 

 to the living Indian elephant. 



