626 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



The measurements show that the proximal phalangeals of Pro- 

 camelvs longurio differ much from those of the dromedary, being at 

 once longer and much slenderer. The shaft in the dromedary is 

 flattened from front to rear; in the fossil, from side to side. These 

 bones resemble more those of the llama. There is present what is 

 taken to be the distal half or more of a hinder first phalange (pi. 123, 

 fig. 4) of the same species (Cat. No. 10169.) Its length must have 

 been 90 mm. or more. At what is thought to be the middle of the 

 length the fore-and-aft diameter is 19 mm.; the side-to-side diameter, 

 13 mm. The width of the lower articular surface is 20 mm.; but 

 here, as in the hinder phalangeals, the width increases somewhat 

 backward on the lower surface. This phalange is to be compared 

 with the phalange, probably a hinder one, figured by Leidy and 

 Lucas, 17 and referred to P. minimus. The one from Arizona was 

 evidently longer than the one from Florida, which measures 87 mm. 

 At the middle of its length the latter has a fore-and-aft diameter of 

 16 mm.; a side-to-side diameter of 14 mm. The former is therefore 

 a more compressed bone. Its distal articular surface is considerably 

 wider and extends upward farther on the lower surface. 



To this species are referred a number of fragmentary bones which 

 are smaller than those of a dromedary and apparently too small to 

 have belonged to P. coconinensis. An injured lumbar vertebra 

 (Cat. No. 10170) had a length of about 60 mm. The anterior end of 

 the centrum is 52 mm. wide. The excavation for the zygapophyses of 

 the preceding vertebra is 33 mm. wide. Somewhat less than the 

 inner half of the distal articular surface of the right humerus has the 

 catalogue number 10171. The front to rear diameter is 67 mm. 

 The distal end of a right radius (Cat. No. 10172) has the surface for 

 the first row of carpals 50 mm. wide. There is present a part of the 

 upper end of an anterior right cannon bone (Cat. No. 10173). A 

 good deal of the inner side is gone. The width of the upper articular 

 surface must have been about 60 mm. Two pieces of the distal end 

 of one or two cannon bones (Cat. No. 10174) are preserved. They 

 may belong to the same leg. One articular surface is 35 mm. wide. 

 A second phalange (Cat. No. 10178), belonging apparently to the 

 hinder foot, is 50 mm. long. 



Family BOVIDAE. 



ANTII.OCAPRA AMERICANA Ord. 



Apparently this species is represented by a single first phalange 

 (Cat. No. 10179). On comparison with corresponding bones of three 

 recent skeletons the fossil is found to resemble one more closely than 

 the latter resembles those of the other skeletons. Rather surprising 

 differences in proportions exist in these bones of the existing pronghorn. 



» Work cited, pi. 18, fig. 8. 



