10 



MAMMALIA. 



+ MARSUPIALIA. 

 POLYPROTODONTIA. 



Didel'phyidoR. 

 + Didelphys valens, sp. nov. 



ungulata. 

 Artiodactyla. 

 Anthracoiheriidce. 

 + Ancodus [Hyopotamus) brachyrhynchus, Osborn and Wortman. 

 + Anthracotherium f pygmceum, sp. nov. 



Elotheriida:. 



* + Elotherium coarctatum, Cope. 



Agriochosridos. 

 + Agri chcerus antiquus, Leidy. 



* + Merychoidodon culbertsoni, Leidy. 



Camelidce. 

 + Poebrotkerium wilsoni, Leidy. 



Tragulidce. 

 + Le/jtomeryx esulcatus. Cope. 



* + Leptomeryx mammifer, Cope. 

 + Leptomeryx spedosus, sp. nov. 



Position uncertain. 



* + Leptomeryx semicinctus, Cope. 



* Hypertragulus iransversus, Cope. 



Pbrissodaotyla. 



JEquidce. 



* + Mesohippus westoni (Cope). 



+ Mesohippus proecocidens, Lambe. 



+ Mesohippus propinquus, Lambe. 



+ Mesohippus brachystylus, Osborn. 



+ Mesohippus stenolophus, Lambe. 



+ Mesohippus planidens, Lambe. 



+ Mesohippus assiniboiensis, Lambe. 



Syracodontidce. 



* + llyracodon nebrascensis, Leidy. 

 + Hyracodon priscidens, Lambe. 



Rhinocerotidce. 



* + Aceratherium mite, Cope. 



* + Aceratherium occidentale (Leidy). 

 + Aceratherium exiguum, sp. nov. 



+ Leptaeeratherium Irigonodon, Osb. and Wort. 



Titano'heriidce. 



* Megacerops angustigenis (Cope). 



* Megacerops selwynianvs (Cope). 



