42 BULLETIN 53^ UNITED STATES NATIONAL MUSEUM. 



573. Hypohippus affinis (Leidy). I^ype. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, pp. 311,402, 

 pi. 21, figs. II, 12. 



See Anchitherium (Hypohippus) affinis. 



no. Hyrachyus agrarius L,eidy. I^Ype. 



lyeft ramus of jaw without teeth. Bridger (Eocene). 

 Smiths Fork, Green River, Wyoming. 



Leidy, Prel. Rept. Geol. Surv. Wyoming, etc., 1871, p. 357; Rept. 

 U. S. Geol. Surv. Terr., I, 1873, pp. 60, 327, pi. 2, fig. 11. 



660. Hyrachyus agrarius I,eidy. Plesiotype. 



Leidy, Rept. U. S. Geol. Surv. Terr., I, 1873, pp. 60, 327, pi. 2, fig. 12 

 (originally described as H. agrestis). 



See Hyrachyus agrestis. 



660. Hyrachyus agrestis lycidy. Type. 



Portion of left lower jaw containing three teeth, dpj, dp^, 

 m^. Bridger (Eocene). Blacks Fork, Green River, 

 Wyoming. 



Leidy, Prel. Rept. Geol. Surv. Wyoming, etc., 1871, p. 357. 



= Hyrachyus agrarius. 



661. Hyrachyus modestus (lycidy). I^ype. 



Leidy, Rept. U. S. Geol. Surv. Terr., I, 1873, P- 67, pi. 2, fig. 13. 

 See lyOphiodon modestus. 



1 106. Hyrachyus singularis Cope. Type. 



Right maxillary bone containing two premolars (p^, p*), 

 and three molars (m^-m^), associated with part of max- 

 illary of opposite side containing p*-m^. Wind River 

 (Eocene). New Mexico. 



Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 19; Rept. U. S. 

 Geogr. Surv. W. lootli Merid., IV, Pt. II, 1877, p. 267, pi. 66, 

 fig. 17. 



= Heptodon singularis. 



138. Hyracodon nebrascensis (L/cidy). Type and paratype. 



139- Leidy, Proc. Acad. Nat. Sci. Phila., 1856, p. 92. 



See Rhinocerous nebrascensis and Aceratherium nebras- 

 censis. 



1079. Hyracotherium angustidens (Cope). Type. 



Cope, Rept. U. S. Geogr. Surv. W. looth Merid., IV, Pt. II, 1877, 

 p. 265, pi. 66, figs. 3, 3a. 



= Eohippus angustidens. 

 See Orohippus angustidens. 



