94 



SINCLAIR— ADDITIONS TO FAUNA OF 



[April 24, 



Neotragocerus improvisus Matthew and Cook. 



The left ramus of a lower jaw (No. 12106 Princeton University 

 Geological Museum, collecting locality loooC), which is doubtfully 

 referred to this form, supports brachyodont molars which register 

 almost exactly with the upper teeth selected by Matthew and Cook 

 as paratypes of Neotragocerus improvisus. With the discovery in 

 the Snake Creek beds of scimitar-shaped horns (Drepanomeryx 

 gen. nov.), presumably of antelope-like animals, correlation of the 

 straight Neotragocerus type of horn with jaw fragments, both upper 

 and lower, supporting short-crowned teeth becomes even more pro- 

 visional than it has hitherto been, since either type of horn is large 

 enough to fit an animal of the size of those to which the jaws be- 

 longed. 



Dromomeryx whitfordi sp. nov. 



Type No. 12054 Princeton University Geological Museum, col- 

 lecting locality lOOoC, an associated pair of horn bases (Fig. 17). 

 Paratype No. 12086 Princeton University Geological Museum, the 

 right ramus of a lower jaw, unassociated with the horns but from 

 the same collecting locahty (Fig. 18). The species is named in 

 honor of my assistant in the field, Mr. A. C. Whitford. Horn 

 bases about one third wider than in D. horealis, with the posterior 

 upper corner of the wing-like expansion at the base of the horn 



Fig. 17. Dromomeryx whitfordi, type specimen, base of left horn, outer side, 

 two thirds natural size. One of an associated pair, No. 12054. 



