TYPE-SPECIMENS OF FOSSIL VERTEBRATES. 47 



580. Merychippus mirabilis Leidy. Paratype. 



Portion of right maxillary containing four teeth p^-m'. 

 Loup Fork (Upper Miocene). Niobrara River, 

 Nebraska. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 27; Jonrn. Acad. Nat. 

 Sci. Phila. (2), VII, 1869, p. 299, pi. 17, figs. 8, 9. 



= Protohippus mirabilis. 



571. Merychippus mirabilis Leid3^ Plesiotypes. 



572. (i) Last right upper molar, m^; (2) last upper molar of left 



581. side; (3) two upper premolars of right side, p^ and p^; 



582. (4) right upper premolar, p". Loup Fork (Upper 

 Miocene). Niobrara River, Nebraska. 



Leidy, Journ. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 299, (i) pi. 

 18, fig. 55; (2) fig. 56; (3) pl- 17, fig- 14; (4) fig- 15- 



= Protohippus mirabilis. 



2574- [Merychippus sp. undet.] 



Fragment of right lower jaw wdth five teeth, p-ni . Middle 

 Miocene. Pojtiaque, New Mexico. 



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

 75, figs. 4, 5 (unnamed). 



[Identified by J. W. Gidley.] 



120. Merychyus elegans Leidy. Cotj^pes. 



121. Right and left upper and lower jaws containing almost 



complete dentition. Loup Fork (Upper Miocene). 

 Niobrara River, Nebraska.^ 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 25; Journ. Acad. Nat. 

 Sci. Phila. (2), VII, 1869, pp. 118, 380, pl. 11, figs. i-i[. 



439. Merychyus major Leidy. I'ype. 



Part of right upper jaw containing third and fourth premo- 

 lars and first and second molar. Loup Fork (Upper 

 Miocene). Niobrara River, Nebraska. 



Leidy, Proc. Acad. Nat. Sci. Phila., 185S, p. 26; Journ. Acad. Nat. 

 Sci. Phila. (2), VII, 4869, pp. 121, 380, pl. 11, figs. 15, 16. 



118. Merychyus medius Leid5^ Type. 



Fragment of left side of lower jaw containing three molars. 

 Loup Fork (Upper Miocene). Niobrara River, 

 Nebraska. 



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

 Sci. Phila. (2), VII, 1869, pp. 119, 121, 380, pl. 11, figs. 12-14. 



156. Merycochcerus proprius Leidy. Type. 



Upper and lower jaws containing nearly complete dentition. 

 Lower Miocene. Near Fort Laramie, Niobrara River, 

 Wyoming. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 24; Journ. Acad. Nat. 

 Sci. Phila. (2), VII, 1869, pp. no, 380, pl. 10, figs. 1-4. 



445. Merycochcerus proprius Leidy. Paratype. 



Last left upper molar. Lower Miocene. Near Fort Lara- 

 mie, Niobrara River, Wyoming. 



Leidy, Proc. Acad. Nat. Sci. Phila., 1858, p. 24; Journ. Acad. Nat. 

 Sci. Phila. (2), VII, 1869, pp. no, 380, pl. 10, fig. 5, 



