58 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



626. [? Protohippus sp. undet.] 



Fragment of right lower jaw containing two molars, m 2 , m 3 . 

 Loup Fork (Upper Miocene). Niobrara River, Ne- 

 braska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 315, pi. 19, 

 fig. 18 (unnamed). 



[Probably a Protohippus. J. W. Gidley.] 



116. [? Protohippus sp. undet.] 



Portion of right lower jaw with symphysis, containing dp 2 

 and dp 4 , p 3 -m 2 . Loup Fork ( Miocene) . Niobrara River, 

 Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila., (2), VII, 1869, p. 316, pi. 

 19, figs. 16, 17 (unnamed). 



[Identified by J. W. Gidley] . 



5416. Protohippus sp. undet. 



Right upper molar. Middle Miocene. Pojuaque, New 

 Mexico. 



Cope, Rept. U. S. Geogr. Surv. W. 100th Mend., IV, Pt. II, 1877, 

 P- 3 2 3, pl- 75, figs. 7, 7a. 



mi. Prototomus hians (Cope). Type. 



Cope, Rept. U. S. Geol. Surv. Terr., Ill, 1884, p. 290. 



= Sinopa hians. 



See Stypolophus hians. 



102 1. Prototomus multicuspis Cope. Type- 



Portion of right maxillary containing three molars (m 1 — m 3 ) 

 and premolar (p 4 ). Wasatch (Eocene). New Mexico. 

 Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 10. 



=Sinopa multicuspis. 



See Stypolophus multicuspis. 



1018. Prototomus multicuspis Cope. Paratiypes. 



1020. (1) Portion of lower jaw containing three molars, m i -m 3 ; 



(2) left lower jaw containing five teeth. Wasatch 



(Eocene). New Mexico. 

 Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 10. 



= Sinopa multicuspis.. 



See Stypolophus multicuspis. 



1025. Prototomus secundarius Cope. Type. 



Incomplete ramus supporting four teeth. Wasatch 

 (Eocene). New Mexico. 

 Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 9. 



= Sinopa secundarius. 



See Stypolophus secundarius. 



1023. Prototomus strenuus Cope. Type. 



Portions of both jaws containing nearly complete dentition. 

 Wasatch (Eocene). New Mexico. 



Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 10. 



= Sinopa strenuus. 



See Stypolophus strenuus. 



