36 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



1060. Eohippus index (Cope). See Hyracotherium angustidens 



1080. and Orohippus angustidens. 



1 081. 

 1087. 



1128. Eohippus loevii (Cope). See Orotherium loevii. 



667. Equus excelsus Leidy. Type. 



Fragment of right maxillary containing four teeth, p 4 — m 3 . 



Pleistocene. Niobrara River, near Hay Springs, Ne- 

 braska. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 26; Journ. Acad. Nat. 

 Sci. Phila. (2), VII, 1869, pp. 266, 400, pi. 21, fig. 31. 



666. Equus excelsus Leidy. Plesiotype. 



Last lower molars of right side m 2 , m 3 . Pleistocene. Paw- 

 nee Loup of Platte River, Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 268, pi. 19, 

 fig- 39- 



619. Equus (Protohippus) perditus Leidy. Type. 



Part of jaw and four upper teeth (p 4 -m 3 ). Loup Fork 

 (Upper Miocene). Niobrara River, Nebraska. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 26. 



= Protohippus perditus. 



1 180. Erethizon venustus (Leidy). See Hystrix (Hystricops) ve- 

 nustus. 



1 104. Esthonyx acer Cope. Type. 



Portion of right lower jaw containing four teeth, p 4 -m 3 . 

 Wasatch (Eocene). New Mexico. 



Cope, App. FF 3 Ann. Rept. Chief of Engineers, in Rept. Sect'y 

 War, II, Pt. II, 1874, p. 594. 



= Esthonyx bisulcatus. 



1 103. Esthonyx bisulcatus Cope. Type. 



Lower jaw containing three molars, associated with two 

 incisors. Wasatch (Eocene). New Mexico. 



Cope, App. FF 3 Ann. Rept. Chief Engineers, in Rept. Sect'y War, 

 II, Pt. II, 1874, p. 594; Rept. U. S. Geogr. Surv. W. 100th Merid , 

 IV, Pt. II, 1877, p. 154, pi. 40, fig. 27-30. 



1 104. Esthonyx bisulcatus Cope. Plesiotype. 



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

 p. 154, pi. 40, figs. 31-310. 



See Esthonyx acer. 



1 1 30. Esthonyx bisulcatus Cope. Plesiotypes. 



5376. (1) Lower molar of left side; (2) fragment of right lower 



jaw containing one molar. Wasatch (Eocene). New 



Mexico. 



Cope, Rept. U. S. Geogr. Surv. W. 100th Merid., IV, Pt. II, 1S77, 

 p. 154, pi. 40, (1) fig. 33; (2) fig. 32, 32a. 



