402 R. S. Lull — New Camels in 



Measurements. 



Cat. No. 10884 Eatio 0. longipes 

 Y. P. M. 



mm. mm. 



Greatest length of atlas 64.5 0.806 80 



Greatest breadth of atlas 58 0.773 75 



Greatest length, cervical V 114 0.674 169 



Length of centrum, cervical V 97 0.647 150 



The ratios show somewhat slenderer bones in No. 10884, 

 together with a relatively long atlas. 



The humerus differs from that of 0. longipes in the 

 form of the trochlea, which shows a greater obliquity 

 in the latter. The proximal end is not preserved, and 

 herein our John Day form resembles Wortman's figure 

 of P. cameloides paratype. No. 7912, A. M. N. H. (see 

 above). In some respects the trochlea suggests the one, 

 in others, the other. Judging from the figure, there is 

 a close agreement with cameloides in size. 



The right ulno-radius is essentially complete, lacking 

 only a very small portion of the distal articulation, which 

 is supplied by its mate. The fusion betw^een the two 

 bones is so complete that the line of demarcation between 

 them is practically obsolete except at the distal end. The 

 element resembles very closely that figmred by Wortman 

 for P. cameloides, from which it differs chiefly in apparent 

 dimensions as taken from the figure. From Oxydac- 

 tyliis, it differs in the greater distinctness of the distal 

 end of the fibula and in certain minor details of the proxi- 

 mal end. 



Measurements. 



ISTo. Oxydac- 



P. camel- 10884 tylus 



oides Eatio Y. P. M. Eatio longipes 

 mm. mm. mm. 



Humerus, length 192* 1.12 215t 0.68 315 



transverse diameter, mid-shaft ... 17 



transverse diameter, distal end ... 38 



Ulno-radius, length 285* 1.07 305 0.69 440 



width, prox. end : . . 34 0.72 47 



width, dist. end 35.5 



width, mid-shaft 23 0.66 35 



* From Wortman 's figure, 

 t Estimated. 



The metacarpus resembles that of Oxydactylus, except 

 in the apparent degree of development of the vestigial 

 metacarpals II and V, which Peterson speaks of as small, 



