10 



MAMMALIA. 



+ MARSTJPIALIA. 

 POLYPROTODONTIA. 



Didelphyidce. 



+ Didelphys valens, sp. nov. 



UNGULATA. 



Artiodactyla. 

 Anthracotheriidce. 

 + Ancodus (Hyopotamus) brachyrhynchus, Osborn and Wortman. 

 + Anthracotherium f pygmceum, sp. nov. 



Elotkeriidai. 



* + Elotherium coarctation, Cope. 



Agriochozridoz. 

 + Agri chcerus antiquus, Leidy. 



* + Merychoidodon culberlsoni, Leidy. 



Camelidce. 



+ Poebrotherium ivilsoni, Leidy. 



Tragulidce. 

 + Leptomeryx esalcatus, Cope. 



* + Leptomeryx mammifer, Cope. 

 + Leptomeryx speciosus, sp. nov. 



Position uncertain. 



* + Leptomeryx semicinctus, Cope. 



* Hypertragulus transversus, Cope. 



Perissodactyla. 



JSquidce. 



* + Mesohippus wesloni (Cope). 



+ Mesohippus prcecocidens, Lambe. 



+ Mesohippus propinquus, Lambe. 



+ Mesohippus brachystylus, Osborn. 



+ Mesohippus stenolophus, Lambe. 



+ Mesohippus j'l'inidens, Lambe. 



+ Mesohippus assiniboiensis, Lambe. 



Hyracodontidce. 



* + Hyracodon nebrasccnsis, Leidy. 

 + Hyracodon priscidens, Lambe. 



Rhinocerotidoz. 



* + Aceratherium mite, Cope. 



* + Aceratherium occidentale ( Leidy). 

 + Aceratherium exiguum, sp. nov. 



+ Leptacerathcrium trigonodon, Osb. and \Vort. 



Titano'heriidce. 



* Megacerops angustigenis (Cope). 



* Megacerops selwynianvs (Cope). 



