the Marsh Collection. 403 



flat, rugose ossicles, on the sides of the functional third 

 and fourth metacarpals. Metacarpal II was apparently 

 free, as there is a distinct facet on the outer posterior 

 corner of metacarpal III contiguous to, but beneath, the 

 trapezoid facet. Metacarpal Y, on the other hand, is 

 represented by a small rugose knob thoroughly coalesced 

 Avith metacarpal IV. Herein, as with the cervicals, the 

 form under consideration is simply more primitive than is 

 Oxydactylus. No mention of these details is made by 

 Wortman, who merely figures the anterior metapodials 

 and records their length. There is no trace of coossifica- 

 tion of the metacarpals, but their flat, somewhat rugose 

 surfaces were closely applied. 



Measurements. 

 P. camel- 

 oidcs Eatio 

 mm. 

 Metacarpals : 



Length 228 0.964 



Breadth, combined, at mid-shaft 21* 1.00 



Breadth, prox. end 28.8" 1.02 



Breadth, dist. end, mcp. Ill ... 16.8* 0.905 



Breadth, dist. end, mcp. IV 16.2* 0.969 



Average 0.972 



Femur : 



Trans, diameter, dist. end 



Diameter, mid-shaft 



Tibia: 



Max. ant. -post, diameter, prox. 



end 



Transverse diameter, prox. end. 



* From the illustrations. 



The phalanges again are comparable to those of Oxy- 

 dactylus, the ungTial being compressed and deer-like. 



Measurements. 



Cat. No 10885 



Y. P. M. Eatio 0. longipes 



mm. mm. 



Length of prox. phalanx 46 0.836 55 



Length of median phalanx 22.2 0.793 28 



Length of ungual 18.5 0.740 25 



Specimen No. 10884, Y. P. M., is distinct from either 

 Paratylopus sternbergi or cameloides, chiefly by its larger 

 size, the robustness of the caniniform teeth, and the length 

 of diastema between P and C^ It is not clear, however, 



No. 10884 



O.lor 



Y.P. 



M. Eatio 



fjipe 



mm. 





mm 



220 



0.638 



345 



21 



0.637 



33* 



29.5 



0.638 



46.2 



15.2 



0.660 



23 



15.7 



0.683 

 0.651 



23 



44.6 



0.666 



67 



22 



0.733 



30 



61 



0.726 



84 



48.3 



0.690 



70 



