﻿BOYSEN RESERVOIR VERTEBRATE FOSSILS — WHITE 201 



this species. Bonillas (1936) has given very good reasons for con- 

 cluding that only one species existed in the Wind River Basin. 



Genus EOTITANOPS Osborn 



EOTITANOPS sp. 



U.S.N.M. No. 18466, fragment of a right mandible with Mi-M, (loo. 

 No. 48FR65) ; U.S.N.M. No. 19104, loose teeth including P3-4 and part 

 of Mx (loc. No. 48FR79). 



This material is too fragmentary to add anything to our knowledge 

 cf the genus. 



Family ISECTILOPHIDAE 



Genus HEPTODON Cope 

 HEPTODON BROWNORUM Seton 



U.S.N.M. No. 18467, badly broken right mandible with P4-M3 and 

 portions of the left mandible (loc. No. 48FR65) ; U.S.N.M. No. 18468, 

 right mandible with P3-M2 (loc. No. 48FR80) ; U.S.N.M. No. 18471, 

 badly crushed skull and jaws with associated skeletal fragments (loc. 

 N0.48FR75). 



This material is referred to Heptodon hrovmotmin on the basis of 

 size, but it is too fragmentary to add anything to our knowledge of 

 the species. 



Order ARTIODACTYLA 

 Family DICHOBUNIDAE 

 Genus BUNOPHORUS Sinclair 



BUNOPHORUS ETSAGICUS (Cope) 

 FiGUBE 79 



U.S.N.M. No. 18370, left mandibular fragment with P4-M3 and 

 alveolae for P^.a (loc. No. 48FR76). 



This specimen is a younger individual than the type (Sinclair, 1914, 

 p. 273) and shows the characters of the teeth much better. While 

 there are some differences the material is not adequate for specific 

 separation. Anterior mental foramen between Pi and Po and the pos- 

 terior below the posterior root of P3 ; very short diastema between P2 

 and P3, both double rooted; P4 with a small anterior tubercle, pro- 

 toconid and deuteroconid well developed, deuteroconid nearly as high 

 as protoconid (Cope, 1884, pi. 25e, fig. 24a, and Sinclair, 1914, fig. 7, 

 indicate that a deuteroconid may have been present but was obliterated 

 by wear) , posterior cingulum with tubercle just lateral to median line ; 

 paraconid appears to be absent on all of the molars, a faint, discontinu- 

 ous cingulum present on anterior, external, and posterior borders; 

 hypoconulid on M3 larger than entoconid and forming a distinct heel. 



