. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 35 pared present no differences of importance. The two Uinta forms agree in the obscure or feeble development of the cusp-like elevations on the anterior face of the molars near the inner angle, more con- spicuously developed in Titanotherium. At the postero-internal angle of the cingulum of M- in the Oligocene forms there is sometimes a distinct tubercle, which is indicated in the Uinta forms by only a slight swelling of the Fig.
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 35 pared present no differences of importance. The two Uinta forms agree in the obscure or feeble development of the cusp-like elevations on the anterior face of the molars near the inner angle, more con- spicuously developed in Titanotherium. At the postero-internal angle of the cingulum of M- in the Oligocene forms there is sometimes a distinct tubercle, which is indicated in the Uinta forms by only a slight swelling of the Fig. I. Crown view of two upper molars Diploceras osborui Peterson. (Para- type. No. 2860a.) X 2- These isolated teeth were found with the Paratype, No. 2860. In proportion the inferior incisor dentition is further in advance of the canine than in P. emarginatum. ly and ly are represented only by a portion of their roots buried in the symphysis. Ig- has a very prominent cingulum posteiiorly. Notwithstanding the much smaller size of the specimen, its crown has ver^^ nearly the same diameter as in P. emarginatum, which would indicate that the inferior incisors were possibly larger in proportion, and more nearly equal in size. The crown of the canine is injured, but its diameteis appear to be equal to those in the superior series, though relatively smaller than in P. emarginatum. Py has a single root and a simple conical crown, which has not received any wear due to its somewhat inferior position. Pa" is submolariform and in its general characters does not differ from the same tooth in P. emargi?iatum. P-g is quite molariform, while Py has a complete molar pattern. There is no difference in the general features of the lower molars in the two genera here compared, and in turn the molars of Diplacodon are on the whole quite similar in their detailed structure to those of the Oligocene genus. The proportion of the alveolar border occupied by the lower pre- molars of this species is
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