Peterson: Material Discovered in Uinta Basin. 41 



seldom so complete as to permit of exact identification. A mandible, 

 No. 2382, found in Horizon B appears to belong to the Halecomorphi 

 of the family Amiidce, and agrees best with Pappichthys (P. plicatus) 

 Cope, " Tertiary Vertebrata ", p. 59, Plate IV, Fig. i. A second speci- 

 men. No. 3031, with a great number of scales in position, found in 

 horizon C, appears to belong to Amia, while a third. No. 2368, from 

 horizon C (near base) are fragments of both rami, which are longer, 

 slenderer, more rod-like, but with a single tooth-row, as in No. 2382, 

 referred to Pappichthys. This specimen may or may not pertain to 

 the same group. 



III. REPTILIA. 



CROCODILIA. 



The fauna of the Uinta sediments includes a number of species 

 of Crocodilia which continued from earlier epochs. These remains 

 are generally found in sandstone of more or less coarse texture and 

 of stream origin, as is the case with the remains of the fishes. In 

 the collections made by the Carnegie Museum in 1908 and 1912 are 

 a number of specimens which represent horizons A, B, and C of the 

 Uinta. C, M., No. 2971, a skull which was found in the upper part 

 of horizon A near White River, Utah, compares best with the de- 

 scription and illustrations of Crocodiltis clavis by Professor Cope, 

 " Tertiary Vertebrata", pp. 157-159, Plate XXII. A lower jaw, CM., 

 No. 2972, found in horizon B, is also referred to C. clavis, while No. 

 2988 is a pair of lower jaws found in horizon C, and represents an 

 animal larger than either Nos. 2971 or 2972. This specimen may 

 very possibly represent a new species, but reliable comparisons and 

 diagnoses of characters cannot be made because of the mutilated 

 condition of the specimen. 



IV. MAMMALIA. 



Order CARNIVORA (Fera;). 

 Family MESON YCHID^E Cope. 

 Genus Harpagolestes Wortman. 



I. Harpagolestes uintensis (Scott and Osborn). 



Proc. Amer. Philos. Soc, Vol. XXIV, 1887, p. 225. 



To this species is referred a lower jaw, together with other parts of 

 the skeleton of one individual, C. M. No. 2961. The remains were 

 found in horizon B of the Uinta formation close to the place where 



