132 



HYOPSODUS, Leidy. Pr. Ac. Nat. Sc., 1870, p. no; U. S. Survey of Terrs., 

 1870, p. 354 ; do. 1871, p. 362 ; Cont. to Ext. Vert. Faun., p. 75. 



H. paulus, Leidy, loc. cit. 



H. minusculus, Leidy. Cont. to Ext. Vert. Faun., p. 81. 



H. gracilis, Marsh. Am. Journ. of Sci., vol. ii., p. 42. 



H. mcarius, Cope. Described in U. S. Survey of Terrs., 1872, p. 609, as 

 Microsyops mcarius. Wheeler's Survey, vol. iv., pt. ii., p. 150. 



MICROSYOPS, Leidy. Pr. Ac. Nat. Sc., 1872, p. 20 ; U. S. Survey of Terrs., 1871, 



P- 363; Cont. to Ext. Vert. Faun., p. 82. 



M. gracilis, Leidy, loc. cit. In the " Contributions," Dr. Leidy, considering 

 Limnotherium, Marsh, as a synonym of Microsyops, has called this species 

 M. elegans. 



HIPPOSYUS, Leidy. Pr. Ac. Nat. Sc., 1872, p. 37 ; Cont. to Ext. Vert. Faun., 

 p. 90. 



H, formosus, Leidy, loc. cit. 



H. robustior, Leidy. Cont. to Ext. Vert. Faun., p. 93 ; Notharctus robustior. 

 U. S. Geol. Survey of Terrs., 1871, p. 364. 



ANTIACODON, Marsh. Am. Journ. of Sci., 3d Ser. vol. iv., p. 210. 



A. venustus, Marsh, loc. cit. 



BATHRODON, Marsh. Am. Journ. of Sci., 3d Ser. vol. iv., p. 211. 



B. typus. Marsh, loc. cit. 



LEMURAVUS, Marsh. Am. Journ. of Sci.. 3d Ser. vol. ix., p. 239. 

 Z. distant, Marsh, loc. cit. 



LIMNOTHERIUM, Marsh. Am. Journ. of Sci., 3d Ser. vol. ii., p. 43. 

 L. tvrannns, Marsh, loc. cit. 

 Z. elegans. Marsh, loc. cit. 

 Z. affine, Marsh. Am Journ. of Sci., 3d Ser. vol. iv., p. 207. 



MESACODON, Marsh. Am. Journ. of Sci., 3d Ser. vol. iv., p. 212. 

 J/. speciosus, Marsh, loc. cit. 



PAL^EACODON, Leidy. Pr. Ac. Nat. Sc., 1872 ; p. 21' U. S. Geol. Survey of 



Terrs., 1871, p. 356 ; Cont. to Ext. Vert. Faun., p. 122. 

 P. verus, Leidy, loc. cit. 

 P. vagus, Marsh. Am. Journ. of Sc., 3d Ser. vol. iv., p. 224. 



TELMATOLESTES, Marsh. Am. Journ. of Sc., 3d Ser. vol. iv., p. 206. 

 T. crassus, Marsh, loc. cit. 



TOMITHERIUM, Cope. Pr. Am. Phil. Soc., 1872, p. 470; U. S. Geol. Survey of 



Terrs., 1872, p. 546 ; Wheeler's Survey, vol. iv., p. 135, pt. ii. 

 T. ro stratum, Cope, loc. cit. ; U. S. Survey, 1872, p. 548. 



ANAPTOMORPHUS, Cope. Pr. Am. Phil. Soc., 1872, p. 554; U. S. Geol. Survey 

 of Terrs., 1872, p. 549. 



A. aniulus, Cope, loc. cit. 



