EXTINCT MAMMALIA OF NORTH AMERICA. 401 



Equns tan. 



Owen : Pr. Roy. Soc. Load. 1869, XVII, 267. 



Remains from the same locality as the preceding. 



Of uncertain reference. 



Equics, LeConte : Proc. Ac. Nat. Sc. 1858, 7. 



Remains from Tambla, Honduras. 



Caballo, DeCastro : De la Exist, de grandes Mam. Fos. en la Isla de Cuba, Habana, 1865, 5. 

 Remains in Cuba. 



PROTOHIPPUS. 

 Protohippns perditus. 



See page 275, 327, PI. XVII, Figs. 1, 2; XXVII, Fig. 5. 

 Equus (Protohippiis) perditus, Leidy : Proc. Ac. Nat. Sc. 1858, 26. 



Remains from the Niobrara River, Nebraska, and Little White River, Dakota. 



Pliocene. 



Protohippus placidns. 



See pages 277, 328, PI. XVIII, Figs. 39-48 ; XXVII, Figs. 6, 7. 



Remains from the Niobrara River, Nebraska, and Little White River, Dakota. 

 Pliocene. 



Protohippns snpremns. 



See page 328, PI. XXVII, Figs. 3, 4. 



Remains from Little White River, Dakota. Pliocene. 



HIPPARION. 

 Hipparion vennstum. 



Leidy : Proc. Ac. Nat. Sc. 1853, 241. 



Hippotherium venustum, Leidy : Holmes' Post-pliocene Fossils South Carolina, 1860, 105, PI. XVI, 

 Figs. 32, 33. 



From the post-pliocene formation near Charleston, South Carolina. 



Hipparion occidentale. 



See pages 281, 326, PI. XVIII, Figs. 1-5 ; XXVII, Fig. 2. 

 Leidy : Proc. Ac. Nat. Sc. 1856, 59 ; 1857, 89 ; 1858, 27. 

 Hippotherium occidentale, Leidy: Proc. Ac. Nat. Sc. 1858, 27. 



From a superficial layer of the tertiary deposits of the Mauvaises Terras of White 

 River and from Little White River, Dakota. Pliocene. 



Hipparion speciosum. 



See page 282, PI. XVIII, Figs. 6-19. 

 Eippodon speciosus, Leidy : Proc. Ac. Nat. Sc. 1854, 90. 



Hipparion (Hippodon) speciosum, Leidy : Proc. Ac. Nat. Sc. 1856, 311 ; 1857, 89 ; 1858, 27. 

 Hipparion speciosum, Leidy : Proc. Ac. Nat. Sc. 1858, 27. 



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