58 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



626. [? Protohippus sp. undet.] 



Fragment of right lower jaw containing two molars, m^, m^. 

 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^ 

 and dp^, Pj-m^. 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. looth Merid., IV, Pt. II, 1877, 

 P-323, pl- 75, figs. 7, 7a. 



nil. Prototomus hians (Cope). Type. 



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



= Sinopa hians. 



See Stypolophus hians. 



102 1. Prototomus multicuspis Cope. I^ype. 



Portion of right maxillary containing three molars (m'-m^) 

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

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



= Sinopa multicuspis. 



See Stypolophus multicuspis. 



1018. Prototomus multicuspis Cope. Paratypes. 



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



(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. I^ype- 



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. 1*ype. 



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. 



