MIOCENE. 



39 



Artiodactyla, Palceomeryx, Bicrocerus, Cosoryx;\ Carnivora, AmpMcyon, 

 Hyeenarctos, Brepanodon ; Quadrumana, Pliopithecus. The ancient genera 

 Anthracotherium and Ccenotherium continue throughout, and the existing 

 genera Arvicola, Lutra, and Sus appear. The succeeding epoch, the Oenin- 

 gian, including with it the horizons of Epplesheim and Pikermi, presents 

 the additional genera Borcatherium, Helladotherium, several genera allied to 

 Antilope, with Hippotherium, the huge edentate Ancylotherium, and the 

 monkey Mesopithecus. 



It is from these materials that we must determine by comparison the 

 American Loup Fork epoch, whose deposits are widely spread, and whose 

 fauna is of well-marked character. Although called by my predecessors 

 Pliocene in age, I have insisted that it should be referred to the Miocene 

 series, and I think that the evidence to that effect which I have produced 

 will be found conclusive. Nevertheless here, as in other American Ter- 

 tiary horizons, the element of geographical peculiarity enters, and diminishes 

 the number of identical types. 



Falunian. 



Steneofiber. 



Macrotherium. 



Ancylotherium. 



Amphicyon. 



Binotherium. 



TetralopJiodon. 



Aceratherium. 



Anchitherium. 



Listriodon. 



Hippotherium (Oeningian). 



Ccenotherium. 

 Anthracotherium. 

 Palceomeryx. 

 Bicrocerus. 



Loup Fork. 

 Steneofiber. 

 Mylagaulus. 



Morotherium. 



Amphicyon.* 

 Gcenobasileus. 

 Tetralophodon. 

 Aphelops. 



Hippotherium. 

 Protohippus. 

 Hipjndium.f 

 Oreodontidce. 



Blastomeryx. 



• CanU ursinua Cope. 



t PUoMppus Marsh. 



