610 



FOSSIL VERTEBRATA OF NORTH AMERICA. 



[BULL. 179. 



Pavlow, M. 1888 A, p. 145. 



Roger, 0. 1896 A, p. 169. 



Trouessart, E. L. 1898 A, p. 772. [Hyracotherium 

 (Eohippus).] 



Wortman, J. L. 1896 A, p. 82. (Syn.? of Hyraco- 

 therium index.) 

 Eocene (Wasatch); Wyoming. 



Eohippus tapirinus (Cope). 

 Cope, E. >. 1875 C, p. 20. (Orohippus. ) 



1877 K, p. 263, pi. Ixvi, figs. 12-16. (Hyra- 

 cotherium.) 

 1881 Y. (Systemodon.) 

 1882 E, p. 183. (Systemodon.) 

 1884 O, p. 619, pi. Ivi, figs. 1, 2. (Systemo- 

 don.) 



1887 N, p. 999, fig. 8. (Systemodon. ) 

 Hay, O. P. 1899 A, p. 593. (Hyracotherium.) 

 King, C. 1878 A, p. 377. 



Matthew, W. D. 1899 A, p. 33. (Hyracotherium.) 

 Osborn and Wortman 1892 A, p. 125, fig. 17, only 



part, if any. (Systemodon.) 

 Pavlow, M. 1888 A, p. 174. (Systemodon.) 

 Roger, 0. 18% A, p. 183. (Systemodon.) 

 Scott, W. B. 1892 A, p. 430. (Systemodon.) 

 Trouessart, E. L. 1898 A, p. 771. [Hyracotherium 



(Eohippus).] 



Woodward, A. S. 1898 B, p. 323, fig. 183. 

 Wortman, J. L. 1896 A, p. 94, pi. ii, fig. K, text 

 figs. 4, 5. (Hyracotherium.) 



Wortman and Earle 1893 A, p. 170. (Systemodon.) 

 Eocene (Wasatch); Wyoming, New Mexico.' 



Eohippus validus Marsh. 



Marsh, O. C. 1876 H, p. 401. 



King, C. 1878 A, p. 377. 



Matthew, W. D. 1899 A, p. 33. (Syn. of E. vasac- 

 ciensis.) 



Roger, 0. 1896 A, p. 169. 



Trouessart, E. L. 1898 A, p. 772. [Hyracotherium 

 (Eohippus).] 



Wortman, J. L. 1896 A, p. 82. (Syn.? of Hyracothe- 

 rium vasacciense. ) 

 Eocene (Wasatch); New Mexico. 



Eohippus vasacciensis (Cope). 

 Cope, E. D. 1872 O, p. 474. (Notharctus.) 



1872 E, p. 471. (Notharctus vasachiensis. ) 



1873 E, pp. 606, 646. (Orotherium.) 

 1873 U, p. 3. (Orotherium. ) 



1875 C, p. 21. (Orohippus.) 

 1884 O, p. 634. (Hyracotherium.) 

 King, C. 1878 A, p. 376. (Orohippus.) 

 Matthew, W. D. 1899 A, p. 33. (Hyracotherium.) 

 Roger, 0. 18% A, p. 169. 

 Trouessart, E. L. 1898 A, p. 771. [Hyracothe- 



rium(Eohippus).] 



Wortman, J. L. 18% A, p. 98, pi. ii, fig. G; text fig. 8. 

 (Hyracotherium.) 

 Eocene (Wasatch); Wyoming. 



PLIOLOPHUS Owen. Type P. vulpiceps Owen. 



Owen, S. 1857 C, p. 54, pis. ii-iv. 

 Cope, E. D. 1881 G, p. 381. 

 1884 O, pp. 618, 650. 

 1887 N, pp. 994,997. 

 1892 S, p. 411. 

 Earle) C. 1896 A. 

 Owen, R. 1860 E, p. 326. 

 Wortman, J. L. 18% A, pp. 83,102. 

 Zittel, K. A. 1893 B, pp. 239, 243. (Syn. of Hyra- 

 cotherium.) 



It is doubtful whether the American species 

 belong to this genus or to Eohippus; indeed, the 

 genus itself is of doubtful validity. 



Pliolophus cristonensis Cope. 

 Cope, E. D. 1877 K, p. 254, pi Ixv, figs. 13, 14. 

 (Orotherium.) 



1875 C, pp. 20, 21. (Orohippus major, not 



of Marsh.) 



1877 K, p. 257, pi. Ixv, figs. 15-17. (Oro- 

 therium loavii. ) 



Cope, E, D. 1884 O, p. 651. (P. cristonensis, P. 



loevii.) 



Matthew, W. D. 1899 A, p. 33. (Hyracotherium.) 

 Roger, O. 1896 A, p. 170. (Pachynolophus.) 

 Trouessart, E. L. 1898 A, p. 772. [Hyracotherium 



(Pliolophus).] 

 Wortman, J. L. 1896 A, p. 102, pi. ii.figs. i, i', text 



figs. 11,12. [Hyracotherium (Pliolophus).] 

 Zittel, K. A. 1893 B, p. 243, fig. 180. (Pachynolo- 

 phus.) 

 Eocene (Wasatch); New Mexico, Wyoming. 



Pliolophus montanus Wort. 



Wortman, J. L. 18% A, p. 103, pi. ii, fig. J; text 



fig. 13. [Hyracotherium (Pliolophus).] 

 Matthew, W. D. 1899 A, p. 33. 

 Trouessart, E. L. 1898 A, p. 772. [Hyracotherium 



(Pliolophus).] 

 Eocene (Wasatch); Wyoming. 



PROTOROHIPPUS Wortman. Type Hyracotherium venticolum Cope. 



Wortman, J. L. 18% A, pp. 91, 104. 

 Osborn, H. F. 1897 G. p. 258. 



Protorohippus venticolus (Cope). 

 Cope, E. D. 1881 D, p. 198. (Hyracotherium.) 

 Unless otherwise indicated, the following 



authors refer this species to Hyracotherium. 

 Cope, E. D. 1884 O, pp. 630, 635, pi. xJix a, figs. 



1-16; pis. xlix 6, xlix c. 



Cope, E. D. 1887 N, p. 995, pi. xxx, text figs. 5-7. 



1887 S, p. 270, pi. vi, figs. 1, 2. 



1888 T. 



1889 C, p. 159. 



Matthew, W. D. 1899 A, p. 36. (Protorohippus.) 

 Osborn. H. F. 1896 C, p. 708, illus. 4. 



1898 Q, pp. 10, 15. 

 Pavlow, M. 1887 A. 



1888 A, p. 114, pi. i, figs. 1, 9. 



