524 THE WASATCH AND BRIDGER FAUN^. 



Smaller ; premaxillary bone short ; tusk trihedral C. aimut. 



JMedium; premaxillary elongate; tusk comi)ressed and grooved C. moleatua. 



Large; last superior molar oval, with augulate posterior crest; its anterior lobe connected with ante- 

 rior cingular crest C. repandus. 



III. Last inferior molar with but one posterior cusp from which a curved crest extends round 

 the posterior border of the crowu. 



■Superior true molars narrow ; external incisors sharply angulate on external face C. curvicristis. 



IV. Posterior inferior molar unknown. 



Posterior superior molar oval; posterior crest straight; internal crest fissured (? normally) ; a complete 

 internal cingulum C. marginatiis. 



The C. eoccemis Owen, belongs to Section I, and the C. anthracoideus 

 El v., and C. oivenii H^b., from France, belong to Section 11. 



Professor Marsh has published a figure of the skull of Coryphodon 

 (Amer. Journ. Sci., 1877, PI. iv, fig. 1), which represents the temporal 

 ridges as converging towards a sagittal crest. This is not found in the C. 

 eoccemis, nor in any of the Ameiican species whose crania are known to me 

 (C eUphantopiis, C. molestus). 



The first known American specimens of the family were discovered 

 "by Dr. Hayden, on Bear River, near Evanston, Wyoming. They repre- 

 sented two species, Bathmodon radians and Corypliodon latipes. I subse- 

 quently visited the same locality and obtained numerous specimens, which 

 further demonstrate the fact that two species were entombed there, and 

 indicate that a third species was associated with them. The C. cuspidatus 

 has been obtained in New Mexico and Wyoming; and the C. obliquus, C. 

 lobatus, C. latidens, C. elephantoptis, C. simns, and C. molestus have only 

 been found in New Mexico. 



Restoration. — The general appearance of the Coryphodons, as deter- 

 mined by the skeleton, probably resembled the Bears more than any living 

 animals, with the important exception that in their feet they were much 

 like the Elephants. To the general proportions of the Bears must be added 

 a tail of medium length. Whether they were covered with hair or not is, 

 of course, uncertain; of their nearest living allies, the Elephants, some 

 were hairy, and others naked. The top of the head was doubtless naked 

 posteriorly, and in old animals may have been only covered by a thin 

 epidermis, as in the Crocodiles, thus presenting a rough, impenetrable front 



to antagonists. 



The movements of the Coryphodons, doubtless, resembled those of the 

 Elephant, in its shuffling and ambling gait, and may have been even more 



