110 



CENOZOIC MAMMAL HORIZONS 

 Bange of Oligocene genera. 



MARSUPIALIA. 



DidelphyidK 



Peratherium . 



CARNIVORA (CREODONTA). 



Hyaenodontidne (HysenodontinEe) 



Pseudopterodon 



Hemipsalodon 



Hysenodon 



CARNIVORA (FISSIPEDIA). 



Canidse 



? Cynodon 



Daphoenus 



Cynodictis 



Paradaphaenus . 



Nothocyon 



Mesocybn 



Temnocyon 



Philotrox 



Enhydrocyon. . 

 Mustelidae 



Bunfelnrus 



Oligobunis 



Felidae 



Dinictis 



Pogonodon 



Nimravus 



IToplophoneus. 



Eusmilus 



INSECTIVORA. 



Leptictidap 



Ictops 



Leptictis 



Mesodectes 



Erinaceidse 



Proterix 



Soricidse 



Protosorex 



Talpidae 



Proscalops 



Chrj^sochloridae 



Aptemodus 



Xenotherium . . . 

 Earn, indet.: 



Microptemodus . 



RODENTIA. 



Sciuridae 



Prosciurus 



Castoridae 



Cylindrodon 



Eutypomys 



Steneoflber 



Ischyromyidae 



Ischy romy s 



Gymnoptychus. 

 Geomyidee 



Entoptychus. . . 



Pleurolicus 



Aplodontiidae 



Meniscoray s 



Mylagaulodon . . 

 Muridae 



Eumys 



Paciculiis 



Peromyscus 



Leporidae 



Palaeolagus 



Lepus 



Lower. 



Middle. 



Upper. 



White 

 River. 



John 

 Day. 



