OF WESTERN NORTH AMERICA. 



97 



MIDDLE EOCENE— Continued. 



TILLODONTIA. 



ANCHIPPODONTIDiE. 

 I 1. I 2. 



Trogosus castoridens Leidy« 



Trogosus minor Marsh 



? Tillotherium sp 



Tillotherium fodiens Marsh 



Tillotherium hyracoides Marsh 

 Tillotherium latidens Marsh. . . 



Paramys dclicatus I.eidy . . 



Paramys delicatior Leidy 



Paramys delicatissimus Leidy. . 



Paramys sp. div ^ . . 



Pseudotomus hians Cope . 



Pseudotomus robustus (Marsh) 



Pscudotomus superbus (O., S., and S.).. 



Pseudotomus sp. div 



Sciuravus nitidus Marsh 



Sciuravus undans Marsh . . . . . 



Sciuravus parvidens Marsh ... 



Sciuravus minimus (Leidy) 



Scmravus sp. div 



Tillomys parvus Marsh . . . 



RODENTIA. 



ISCHYROMYIDJE. 



X 





X 





X 





X 



X 



X 





X 





X 





X 





X 





X 





X 





X 





X 





X 





Paramys leptodus (Coi)e; , 



Paramys sp. div. . . 



Pseudotomus sp. div 



Sciuravus sp. div , . 



Colonomys celer Marsh. . . 

 Taxymys lucaris Marsh . . 

 Tillomvs senex Marsh 



Stylinodon minis Marsh. 



T^NIODONTA. 



Stylinodontid^. 



-.1 ? I il 



Metacheiromys marshi Wortman. 

 Metacheiromys dasypus Osborn. . 

 Metacheiromys tatusia Osborn . . . 



EDENTATA. 



Metacheiromyid^. 



]1 Metacheiromys sp. 



AMBLYPODA. 



KOBASILEID^ ( = UlNTATHERIID^). 



? Uintatherium sp. 



IJintatherium robustum Leidy 



Uintatherium latifrons Marsh 



Uintatherium leidyanum O., S., and S. 

 Uintatherium spierianum (S. and O.) b 



U. (Dinoceras) mirabile Marsh 



U. (Dinoceras) agreste Marsh 



U. (Dinoceras) laticeps Marsh.. 



U. (Dinoceras) lucare Marsh 



U. (Tinoceras) anceps Marsh 



U. (Tinoceras) crassifrons Marsh 



U. (Tinoceras) hians Marsh 



U. (Tinoceras) grandis Marsh _.. 



U. (Tinoceras) ingens Marsh _ . 



U. (Tinoceras) longiceps Marsh '. 



U. (Tinoceras) pugnax Marsh 



U. (Tinoceras) stenops Marsh 



U. (Tinoceras) vagans Marsh 



U. (Tinoceras) afhnis Marsh. _ 



U. (Tinoceras) annectens Marsh 



PERISSODACTYLA. 



Hyracodontid^. 



Hyrachyus agrarius Leidy. . 



Hyrachyus sp. div 



? Hyrachyus bairdianus (Marsh) . . . 

 Hyrachyus paradoxus O., S., and S . 

 Colonoceras agrestis Marsh 



X 





X 



X 



I 









? 





Hyrachyus eximius Leidy . . . 



Hyrachyus intermedius O., S., and S. 

 Hyrachyus crassidens 0.» S., and S. . . 



Hyrachyus princeps Mai sh 



Hyrachyus imperialis O., S., and S. . . 



Hyrachyus sp. div.-. 



Triplopiis cubitalis Cope. 



" Triplopus " amarorum Cope. 



X 

 X 

 X 



a Identified by Leidy with Anchippodus vetulus from a Tertiary formation in New Jersey. The 

 type of A. vetulus is indeterminate generically, and it is not certain that it belongs to the same family 

 as Trogosus and Tillotherium. I retain Trogosus as distinct in order to avoid a misleading correlation. 



b This species may belong to the upper " Washakie " level, and to the genus Eobasileus. 



56092— Bull. 361—09 7 



