Peterson: Material Discovered in Uinta Basin. 45 



ridge, which seems to be less developed in the present species. This, 

 however, may be partly due to crushing. The supinator ridge appears 

 to be somewhat less developed than in L. verus. 



The proportionate length of the ulna and radius is the same as in 

 Limnocyon verus. The fore-arm answers quite well to the description 

 given of L. verus by Matthew, except that the olecranon process of 

 the present specimen is shorter. 



The fore-foot is preserved with the exception of the ungual pha- 

 langes, the trapezium, a portion of the trapezoid, and Mc. i. The 

 carpus is low and broad, the metacarpals quite long in comparison 

 with the length of the radius and ulna, and the phalanges are long, 

 those of the proximal row with the shafts quite convex dorsally. 

 The scaphoid and centrale, or what I take to be a portion of the cen- 

 trale, appear to be united, and the lunar is also apparently fused, or 

 nearly fused, with the scaphoid. The cuneiform is not complete, 

 but appears to be high, with the articulation for the ulna excavated 

 anteroposteriorly and having a large concave facet for the pisiform. 

 The latter is of large size, with the termination of the tuberosity con- 

 siderably expanded, especially supero-inferiorly. The unciform is 

 large and the facet for the cuneiform is very oblique. The metacar- 

 pals are moderately spread, their shafts have an oval cross-section, 

 and are more expanded laterally near the distal end. The median 

 phalanges are depressed. The unguals are not represented in the 

 specimen. 



Genus Limnocyon Marsh. 

 3. Limnocyon douglassi sp. nov.' (Plate XXXIV, Figs. 11-14). 



Type: Fragments of skull, lower jaws, and other portions of skeleton, 

 C. M. No. 3373- 



Horizon: Uinta Eocene, horizon B. 



Locality: Eastern end of Uinta Basin, Uinta County, Utah. 



Specific Characters: Premolars relatively small; Pj suddenly en- 

 larged; P- with anterior and posterior accessory cusps proportionally 

 small. Type representing art animal slightly larger than Limnocyon 

 potens of the Washakie Eocene. 



A portion of the right maxillary, with P-, P-, and My are very 

 nearly complete; the roots of M- and the anterior premolars are pre- 

 served in the specimen. There is also a fragment representing the 



5 In honor of Mr. Earl Douglass who found the type in 1908. 



