30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I31 



toreodon pearcei size is no longer an aid. Teeth of Diplobunops are 

 slightly less selenodont. The inner and outer crests of the upper molars 

 are seemingly farther apart with the outer cusps a trifle more erect and 

 their apices more buccal or not so lingually directed. The cusps or 

 crests of the lower molars have a slightly more inflated or obtuse look 

 and may be relatively broader. There is, of course, variation in both 

 forms ; moreover, these characters of the teeth are scarcely of generic 

 significance and seem somewhat distinctive only between contempo- 

 raries in these groups in the higher horizons of Uintan time. 

 Diplobunops, so far as known, did not progress much beyond the 

 Protorcodon tooth structure characterizing Uinta B time. The genera 

 are, as I have attempted to show earlier (1955), very closely related 

 and their skulls may be distinguished essentially on the different char- 

 acter of the anterior part of the snout. 



OROMERYCIDAE 



MALAQUIFERUS TOURTELOTI Gazin, 1955 

 Plate 3, figure 2 



The type of this form is from the Dry Creek occurrence some 20 

 miles to the west of the Badwater Creek localities. Its description and 

 illustration were included in an earlier paper (1955, pi. 16), and need 

 not be repeated here. An isolated oromerycid upper molar (U.S.N.M. 

 No. 21 102) in the Badwater collection exhibits the same rectangular 

 form, rugosity, posteriorly bifurcate protocone, and outstanding ribs 

 on the outer cusps as in Malaquiferoiis tourteloti. It corresponds 

 closely in form and size, and in the possession of a slightly outward- 

 deflected metastyle to IVP. It differs in having a heavier, antero- 

 posteriorly developed mesostyle. The shape of this tooth is entirely 

 different, although structurally related to that in Oromcryx plicatus. 

 Likewise, it would not be confused with the comparatively large 

 Protylopusf annectens. 



This tooth lends support to the belief that the Dry Creek occurrence 

 is probably equivalent in time to that at Badwater, a conclusion earlier 

 reached on the basis of lithology, and the general upper Eocene indica- 

 tion by the presence of Eoinoropus. 



LEPTOMERYCIDAE 



LEPTOTRAGULUS, cf. MEDIUS Peterson, 1919 



Plate 3, figure S 



Two lower jaw portions, and probably several of the isolated molars, 

 represent a form close or identical to the upper Uintan Lcptotragulus 



