Peterson : Miocene Beds of Nebraska and Wyoming. 61 



species than in the specimen under consideration. The unciform has 

 a heavy projection on the antero-radial face, which extends upwards 

 and radially over the ulnar border of the magnum. This character of 

 the unciform is quite similar to that in Chalieotherium, but not so 

 nearly like that in Maerotherium giganteum. On the posterior face 

 of the trapezoid is an unusually deflected proximal articulation similar 

 to that in Chalieotherium. 



While the length of metacarpal II. is very nearly the same as in 

 Maerotherium giganteu?n the bone is otherwise much lighter. Meta- 

 carpals III. and IV. are broken off a short distance below the heads. 



The coossined first and second phalanges were found with this 

 specimen and they are like those described by Professor Marsh. 25 



The head of the femur rests on a very short neck and the great 

 trochanter apparently does not extend above the head. There is a 

 broad and rugose third trochanter on the femur, a character which is 

 wanting in Chalieotherium. The lesser trochanter is also quite promi- 

 nent in our specimen. The condyles of the femur are broken. The 

 tibia, which is short and heavy, has a prominent spine, which sepa- 

 rates the broad articular facets for the distal end of the femur ; the 

 cnemial crest is well developed. The fibula, though small, has a 

 complete shaft. 



Measurements. 



mm. 



Greatest length of radius and ulna 600 



Vertical diameter of scaphoid 40 



Vertical diameter of trapezoid 30 



Length of metacarpal II 170 



Transverse diameter of carpus at the head of the metacarpals 96 



Length of femur, approximately 5°° 



Length of tibia 385 



Greatest length of calcaneum 113 



Transverse diameter of tuberosity of calcaneum near the free end 35 



Vertical diameter of astragalus 64 



Greatest transverse diameter of astragalus 82 



A pair of lower jaws (No. 1595, Cam. Mus. Cat. Vert. Fos.), 

 which were found in the Agate Spring Fossil Quarry by Mr. W. H. 

 Utterback, throw additional light upon the characters of this little 

 known genus. I-g-, C ¥ , P-3, M-g-. The incisors are procumbent and 

 crowded ; they have long and heavy roots, broad and thick crowns, 



25 Am. Jour. Set. (3), XIV., pp. 249-250, 1877. 



