212 Bulletin Ajtien'can Museum of Natural History. [Vol. X, 



The metacarpal IV agrees in length (54 mm.), and lends some 

 probability to an association witli that of the complete carpus 

 No. 4351 from the Wind River.' This associated complete carpus 

 (Fig. 26) agrees with some specimens of Uiiitatheriuiu in the very 

 exceptional character that tlie cuueiforni articulates with Meta- 

 carpal V. 



Series I. — Primitive, narrow-crested Skulls. Canines 

 ROUNDED. Incisors subequal in size. 



The lower teeth are unknown, and the ancestral members of 

 this series have not thus far been determined in the underlying 

 Wasatch formation. 



27. Coryphodon wortmani, sp. nov. 



Type, No. 2977, Am. Mus. Coll. Loc, Wind River, Wyo. 



Definition. — Superior m and pm = i54. Superior canines rounded. Occiput 

 very high and narrow. Supratemporal ridges converging posteriorly to form a 

 comparatively narrow sagittal crest. 



Fig. 27. Coryphodon woi-imani, type- Lateral view of skull and section <if superior 

 canine.^ 



The discovery of this type (Figs. 18 and 27) in the high level of 

 the Wind River Beds is most surprising. It is far more j)rimitive 

 both in its narrow cranium and rounded canines than any of the 



' This carpus was mistakenly described by Cope as coming from the Wasatch. Dr. Wort- 

 man identifies it as found by himself in the Wind River. 

 ^ Dedicated to my colleague Dr. J. L. Wortman. 



