Peterson: Material Discovered in Uinta Basin. •93 



Measurements — Conlinucd. 



Transverse diameter of M ' 9 mm. 



Antero-posterior " " " 9.5 " 



" M? : 9 



Transverse " " " 10 " 



" M^ 10 " 



Antero-posterior " " " 10 *' 



Depth of inferior ramus at M j 15 



" ' " M.^ 17 



Antero-posterior diameter of inferior molar series 31 



" Mj 8 



Transverse " " Mj; 5 



" M^ 6 



Antero-posterior " " " ': . . . 8.5 " 



" M3 14 " 



Transverse " " " 6 



" diameter of distal end of humerus 17.5 " 



Antero-posterior diameter of distal end of humerus 12 " 



Length of Mc. II 50 



Family HYPERTRAGULID^. 

 Genus Leptotragulus Scott and Osborn. 

 26. Leptotragulus proavus Scott and Osborn. (Plate XXXVII, 

 Figs. 5-13)- 



Proc. American Philosophical Society, Vol. XXIV, 1887, p. 258. 



A number of fragments of the upper and lower jaws in the Carnegie 

 Museum, collected from the Uinta, reveal a few anatomical points not 

 heretofore established. It is very evident that the genus possessed 

 three lower incisors of sub-equal size, separated from the canine by a 

 quite short diastema. In C. M. No. 3009 the canine tooth is just 

 appearing through the alveolar border, and it presents a crown of 

 quite large size with an oblong outline on cross-section, a rather sharp 

 border, posterior and anterior, and a greater convexity on the internal 

 face than on the external. The tooth has a procumbent position, as 

 already stated by Professor Scott. I certainly am inclined to regard 

 the tooth as a canine. This tooth is followed by a diastema back of 

 which is a two-rooted premolar (See PI. XXXVTI, Figs. lo-ii). 

 Unfortunately the ramus is broken back of this premolar, and we are 

 unable to now definitely say whether or not it is isolated, but from 

 Professor Scott's description and my own observation of the type, 

 we are assured that there are three premolars in a continuous row back 



