PATE CXL 
Limp AND Foot Bones or MiocENnE EQuips® 
Nomenclature 
Cope 1880-3 Revised 1915 
Protohippus sejunctus (in part) Merychippus isonesus 
Protohippus perditus Protohippus sp. aff. perditus 
Hippidium ? pernix ? Hipparion sp. 
Fics. 14. Merychippus ? isonesus (Cope, 1889). Limb and foot bones with skull. Amer. 
Mus. No. 8105, Cope Coll., Deep River beds, Deep River (Smith Creek), Montana. 
Fig. 1, la, ulno-radius, anterior and external views, one-half natural size; fig. 2, 
2a, 2b, 2c, fore foot, anterior and external views, with proximal and distal views of 
metatarsus half natural size; fig. 3, proximal view of magnum and unciform with 
part of metacarpal III, two-thirds natural size; fig. 4, proximal view of tibia, 
one-half nature. See also pl. CXLVIIIa. 
Vic. 5-6. Protohippus sp. aff. perditus. Parts of skeleton associated with upper jaw figured 
on pl. CXLVITIa, Am. Mus. No. 8340, Cope Coll., from Republican River beds, of 
Nebraska. Fig. 5, pelvis, inferior view; fig. 6, 6a, 6b, anterior, internal, proximal 
views of median metatarsal; both one-half natural size. 
Fic. 7. Atlas, unidentified (not Equid). 
Fic. 8. ? Hipparion sp. Metatarsal III and proximal phalanx, anterior and external views and 
proximal view of metatarsal, one-half natural size. Amer. Mus. No. 8357, Cope 
Coll. Republican R. beds, Nebraska. (The specimen includes remains of more 
than one individual and no teeth are associated, so that the reference is wholly 
doubtful. It has the proportions of the American species of Hipparion but is 
exceptional among them in the tarso-metatarsal articulation). 

