DAKOTA AND NEBRASKA. 



109 



O. Culbert'i. O. gracilis. 



Lines. 



Lines. 



Breadth of the two bones in conjunction near the middle, 



Length of olecranon, 



Breadth " 



Breadth of head of radius, 



Breadth of lower end of do., 



Breadth of lower end of the ulna. 



Greatest width of radius near middle, 



Greatest width of ulna " " 



In conjunction with a specimen of the lower portion of the fore-arm bones of 0. 

 Culbertsoni, a carpus and metacarpus are preserved. The former consists of seven 

 bones, as in the Hog. 



The metacarpus likewise consists of four bones as in the latter animal, and are 

 quite as well developed, but are proportionately longer and narrower. The lateral 

 pair are even better developed in relation with the intermediate ones than in the 

 Hog, and the first of the series is longer and larger than the last one, the reverse of 

 the condition in the Hog. Of the intermediate pair, the second not only extends 

 higher than the third one, but also lower. A specimen of the greater portion of a 

 fore foot of Greodon gracilis exhibits the same construction of the metacarpus as in 0. 

 Culbertsoni. 



Measurements of the metacarpals are as follows : 



0. Culbert'i. O. gracilis. 



Lines. Lines. 



Length of first metacarpal, . . . . .21 16 



" second " ..... 28 21 



third " 24J 19 



" fourth " ..... 19 15 



Posterior extremities. — A fragment of the iliac portion of a hip bone, attached to one 

 of the specimens of the sacrum of 0. Culhertsoni before mentioned, exhibits a greater 

 relative breadth and degree of flatness than in ordinary ruminants, the Hog and the 

 Peccary. Another specimen of the portion of a hip bone, partially imbedded in a 

 mass of rock, together with the skull, several vertebras, and other bones of the extre- 

 mities of a young animal, has the ischio-pubic portion an inch and a half in width. 



Numerous fragments of the femur of Oreodon indicate this bone to have nearly the 

 form and proportions of that of the Peccary. Measurements derived from specimens 

 of the species 0. Culbertsoni and 0. gracilis are as follows : 



