MULTITUBERCULATA. 



253 



articular facette for a distinct coracoid ; and a T-shaped inter- 

 clavicle is known. The two latter bones have been theoretically 

 associated with a calcaneum and astragalus, and the whole 

 series named Camptomus amplus. 



FIG. 149. 



Jaws of Polymastodon, about one-half nat. size. L. Eocene (Puerco); New 

 Mexico. (After Osborn and Earle.) 



A. Polymattodon attenuatus; outline side-view of upper and lower jaws. 



B. Polymastodon attenuatus; upper dentition, oral aspect, m 1, m 2, first and 

 second molars ; p 4, fourth premolar. 



C. Polymastodon taoensis ; mandible, oral aspect. Same lettering. 



