EXTINCT MAMMALIA OF NORTH AMERICA. 391 



HYRACODON. 



Hyracodon nebrascensis. 



(See page 232. 

 Rhinoceros Nebrascensis, Leidy : Proc. Ac. Nat. Sc. 1850, 121 ; 18.5.3, 392 ; 1857, 89. Owen's Rep. 



etc. 1852, 556, Tab. XII A, Fig. 6, XII B, 5, XV, 3. Anc. Fauna Neb. 1853, 81, PI. XIV, 



XV. 

 Aceratherium Nebrascensis, Leidy: Proc. Ac. Nat. Sc. 1851, 331 ; 1854, 157. 

 Hyracodon nebrascensis, Leidy : Proc. Ac. Nat. Sc. 1856, 92 ; 1857, 89 ; 1865, 176. 



Mauvaises Terres of White River, Dakota. Miocene. 



TAPIRID.E. 



TAPIRUS. 



Tapirus americanus. 



Tapir, Carpenter : Am. Jour. Sci. 1842, XLII, 390; 1846, I, 247. Stuff: L'Institut, 1846, XIV, 



396, fide Jahrb. f. Mineralogie, 1848, 127. Tuomey ; Rep. Geol. South Carolina, 1848, 165, 



166, 208. Cope : Proc. Ac. Nat. Sc. 1867, 138. Blake : Am. Jour. Sc. 1868, XLV, 381. 

 ? Pakcoiheria, Tuomey : Rep. Geol. South Carolina, 1848, 203. 

 TapiriiS Americanus fossilis, Leidy : Proc. Ac. Nat. Sc. 1819, 180 ; 1854, 199 ; Waile's Rep. Agric. 



&c. Mississippi, 1854, 280 ; Holmes' Post-pliocene Fos. South Carolina, 1860, 106, PL XVII, 



Figs. 1-3, 6, 11, 12. 

 Pachyderm, Agassiz: Proc. Am. Assoc. Adv. Sc. 1851, V, 179. 



Remains, mostly of teeth and jaw fragments, undistinguishable from the corres- 

 ponding parts of the living Tapirus terrestris, have been found in Texas, Louisiana, 

 Mississippi, South Carolina, Virginia, Ohio, Illinois, California and elsewhere. Seeing 

 that different known species of Tapirs exhibit but little or no differences in the parts 

 corresponding to the fossil specimens just indicated, it is not improbable that these 

 really belong to an extinct species. Quaternary in North America. 



Tapirus Haysii. 



Tapir, Hays : Proc. Ac. Nat. Sc. 1852, 53. 



Tapirus Eaysii, Leidy : Proc. Ac. Nat. Sc. 1852, 106, 148 ; 1854, 200 ; Auc. Fauna. Neb. 1853, 9 ; 

 AVaile's Rep. Agric. &c. Mississippi, 1854, 286 ; Holmes' Post-pliocene Fos. South Carolina, 

 1860, 106, PI. XVII, Figs. 4, 5, 7-10. Cope, Proc. Ac. Nat. Sc. 1869, 3. 

 Remain.s, consisting of teeth and jaw fragments, from Kentucky, Indiana and Mis- 

 sissippi, apparently indicate a more robust species than the former one. Quaternary. 



LOPHIODON. 



LopKiodon occidentalis. 



See page 23'.), PL XXI, Figs. 28-30. 

 Leidy : Proc. Ac. Nat. Sc. 1868, 232. 

 From the Mauvaises Terres of White River, Dakota; supposed to be derived from 

 the lowest stratum of the tertiary deposit of that locality. Miocene. 



Of uncertain reference. 



Lvpliiodou., Owen : I'r. Cieol. Soc. Luudoa, 1842, III, 693. 



