46 



AMERICAN MESOZOIC MAMMALIA 



M^ 



M'^ 



Fig. 22. Morrison pantotheres. Typical lower molars. A, 

 Dryolesies, internal, crown, and external views. B, Lao- 

 lestes, internal, crown, and external views. C, Atnblo- 

 therium, internal, crown, and external views of Mj, and 

 internal view of M^. D, Kepolestes, internal views of 

 M3 and Mj, without protoconid. E, Archaeotrigon, inter- 

 nal and crown views. F, Tathiodon, internal and crown 

 views. G, Docodon, internal and external views. Not to 

 scale. 



