34 VERTEBRATA OP THE TERTIARY. 



divisions than their disappearance. The follo\ving table is compiled from 

 the writings of Gervais, Gaudry, Pomel, Filhol, Renevier, and others, but is 

 not as complete as I would desire. 



SUESSONIAN. FaLUNIAN. 



Pantodonta. Anchitherium. 



Parisian (Bruxellian, Bartonian, Anthracotherium. 

 and Sestian). Paheochcerus. 



Pal(eoj)his (Bruxellian). Ccenotherium. 



Proviverra. Oeningian. 



Pterodon. AncyJotherium. 



Mesodonta. Dinotherium. 



Lophiodon (Bruxellian). Hippotherium. 



ToNGRiAN. Aceratherium. 



PakEotheridce. Subapennine. 



Chalicotherinm. Mastodon. 



Anoplotheridce. Tapirida. 



JSlotherium. Diluvial. 



Aquitanian. Hycena. 



Hycenodon. JDrepmiodon. 



Hyopotamus. Elephas. 



Ehinocerus. 

 Hippopotamus. 



The above tables show that the history of mammalian life in the two 

 continents presents many points of resemblance ; but that there is a great 

 difficulty in coirelating the epochs represented by the known faunjE. As 

 regards the two primary divisions, Eocene and Miocene, they have no special 

 raison d'etre, as such faunae as the Tongrian and Oeningian are absolutely 

 transitional in their character. More detailed comparisons of the European 

 and American faunae bring out many relationships not displayed by the 

 above tables, and which I will now briefly consider. 



In the American Bridger, various genera of Mesodonta represent the 

 few Adapidae of the Parisian, the genus Adapts* Cuv. being probably com- 

 mon to the two continents. A near ally of the American Anaptomorphus, a 



* A'otharctut i» undiatingaiBhuble from Adapis in inferior dontal cboracttini. 



