CHORDATA — VERTEBRATA — MAMMALS 



383 



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Fig 164. — Outline restorations of some of the more characteristic mammals living 

 in North America during the Ice age (Pleistocene). These are reduced to a uni- 

 form scale, with a pointer dog (in the frame) to show relative sizes. Note the 

 difference in size between these and the Eocene mammals (Fig. 163). i. The Co- 

 lumbian elephant {Elephas columbi). 2. The giant ground-sloth {Megalonyx 

 jefersoni), an edentate. 3. Stag-moose {Cervalces scotti), one of the artiodactyl 

 ungulates. 4. The American mastodon {Mammut americanum). 5. The giant 

 he.dt.\tx {Castoroides ohioensis),a.rodQi\t. 6. Texas horse (£g««.y 5co//t) . 7. Saber- 

 tooth tiger {Smilodon calif ornicus) . (From Scott.) 



