102 



CENOZOIC MAMMAL. HOItlZONS 

 Bange of Eocene genera — Continued, 



Basal. 



First 

 phase. 



Second 

 phase. 



T^NIODONTA. 



Stylinodontidse, , , . . 



Wortmania, , 



Psittacotherium. , 



Calamodon (inch Dryptodon) . 



Ectoganus 



Stylinodon 



Conoryctidse 



Onychodeetes 



Conoryctes 



EDENTATA. 



Metacheiromyidse: 

 Metaeheiromys . 



AMBLYPODA. 



Periptychidse 



Periptychus 



Ectoconus 



Conacodon 



Hemithlseus 



Haploconus 



Anisonchus 



Pantolambdidse 



Pantolambda . . 

 Coryphodontidse. . . 



Coryphodon 



Eobasileidae 



Bathyopsis 



Uintatheriuma. 



Eobasileus 



CONDYLARTHRA. 



Phenacodontidae 



Protogonodon 



Euprotogonia ( = Tetraclsenodon ) 



Phenacodus 



Ectocion 



Meniscotheriidae 



Meniscotherium i> 



PERISSODACTYLA. 



Hyracodontidae 



Hyrachyus 



Cdlonoceras 



Triplopus 



Amynodontidae 



AmjTiodon 



Lophiodontidap 



Heptodon 



Ilelaletes c 



Desmatotherium . 

 Tapiridae 



Systemodon 



Isectolophus 



Equidae 



Eohippus d 



Orohippus e 



Epihippus 



Titanotheriidae 



Lambdotheriuiii . 



Eotitanops 



Palaeosyops 



Limnohyops 



Telmatherium . . . 



Manteoceras 



Dolichorhinus . . . 



Diplacodon 



Lower. 



First Second 

 phase, phase. 



10 



2+ 



Middle. 



First Second 

 phase, phase. 



?1 



5+ 

 ? 1 



9 



Upper. 



First 

 phase. 



Second 

 phase. 



a Including Dmoceras and Tinoceras. 



Including Hyracops. 

 c Including Dilophodon. 

 a Including Protorohippus. 



e Including Orotherium, Helohippus, Oligotomus, and Helotherium. 



