528 THE WASATCH AND BEIDGER FAUN^, 



whether these belong to this species or to the B. radians. These bones, or 

 at least the femora, represent two individuals. On October 8, I obtained 

 part of another scapula of this species. I did not procure any astragalus. 

 Their uniformly inferior size distinguishes these bones from those of 

 the B. radians, which I procured at the same place on October 5. The 

 difference in the form of the glenoid extremity of the scapula, pointed out 

 above, is maintained by these specimens. The important peculiarity in 

 the form of the proximal extremity of the humerus remains to be noticed. 

 In the B. radians, obtained by Dr. Hayden and myself, the greater tuber- 

 osity is hugely developed, its proximal extremity forming a subhorizontal 

 table nearly as wide as the articular head of the humerus at its middle. 

 The surfaces of the head and tuberosity are separated by a low curved 

 crest which descends to the external border of the bicipital groove. In the 

 C. latipes the great tuberosity, though large, is not nearly so wide proxi- 

 raally, its transverse diameter being scarcely half that of the articular face, 

 on a transverse line passing just posterior to the bicipital groove. This 

 difference is partly due to a more external position of the ridge separating 

 the articular from the rough surfaces. The teres and pectoralis facets are 

 large and impressed in the C. latipes; the latter being bounded below by a 

 sudden retreat of the surface. The lesser tuberosity is not large, and con- 

 sists of the anterior prominence of the inferior border of the pectoralis 

 facet. The deltoid ridge is not distinct proximally, but becomes very 

 prominent below the middle of the shaft, where it is twisted forwards as it 

 descends. It is more prominent than in the humerus I figured in Captain 

 Wheeler's report, PI. LXII, fig. 1, from New Mexico. The internal epi- 

 condyle is prominent, while the external is wanting. The external twisted 

 marginal crest is prominent and soon descends into the shaft. 



Measurements of humerus. 



M. 

 Total length 323 



. , . (transverse in one line J «fg'"'==^**^^t"^"°'*"y ^^'^ 



Proximal diameters ^ (of articular surface 067 



( anteroposterior r*=^«'^'^*'i'^"°^'ty ^^^ 



( at bicipital notch 075 



( transverse P°*'^^ ■ ^-^ 



Distal diameters) \ of condyles at middle 071 



( anteroposterior external condyle 058 



