TYPE-SPECIMENS OF FOSSIL VERTEBRATES. 39 



2573. Hipparion speciosum Leidy. See Hippotherium speciosum. 



601. Hipparion sp. undet. 



Various lower molars of different individuals. Loup Fork 

 (Upper Miocene). Niobrara River, Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 322, pi. 19, 

 figs. 30-36. 



599. Hipparion sp. undet. 



Three upper milk molars, all of right side (three individu- 

 als). Loup Fork (Upper Miocene). Niobrara River, 

 Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 289, pi. 18, 

 figs- 34-36. 



= Neohipparion sp. undet. 



596. Hipparion sp. undet. 



Two upper teeth, m 2 right, and p 3 or p 4 , left. Loup Fork 

 (Upper Miocene). Niobrara River, Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, pi. 18, figs. 21, 33. 



= Neohipparion sp. undet. 



574. Hipparion sp. undet. 



575. Second and fourth upper milk molars. Loup Fork (Upper 



Miocene). Niobrara River, Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 291, pi. 18, 

 figs- 37, 38. 



= Neohipparion sp. undet. 



3757. Hipposyus formosus Leidy. Type. 



First and second upper left molars. Bridger (Focene). 

 Near Fort Bridger, Wyoming. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1872, p. 37; Rept. U. S. Geol. 

 Surv. Terr., I, 1873, p. 90, pi. 6, fig. 41. 



3750. Hipposyus robustior (Leidy). Type. 



Leidy, Rept. U. S. Geol. Surv. Terr., I, 1873, p. 93, pi. 6, fig. 40. 

 See Notharctus robustior. 



2572. Hippotherium calamarium Cope. Type. 



Palate with teeth and fragments of lower jaw. Middle 

 Miocene. Pojuaque, near Santa Fe, New Mexico. 



Cope, Proc. Acad. Nat. Sci. Phila., 1875, p. 259; Rept. U. S. Geogr. 

 Surv. W. 100th Merid., IV, Pt. II, 1877, p. 321, pi. 75, figs. 

 1, 2, 2a. 



= Merychippus calamarium. 



3306. Hippotherium gratum Leidy. Plesiotype. 



Lucas, Trans. Wagner Free Inst. Sci. Phila., IV, Pt. II, 1896, p. 49, 

 pi. 19, figs. 9, 10. 



= Hipparion ingenuum. 



See Hippotherium ingenuum. 



