IV.] LIST OF FAMILIES. 1/5 



Pacific side of North America. Insectivores abundant. In the 

 following list of more or less widely distributed families the ma- 

 jority are for the most part confined to this realm, while the others 

 contain exclusively Arctogaeic genera. Such groups as are prac- 

 tically confined to Arctogaea are printed in italics, those which are 

 extinct having an * prefixed ; while the letter H. denotes such of 

 the existing ones as are restricted to the Holarctic region : 



INSECTIVORA. 



Talpida. H. 



Soricidce. Enters Austro-Malayan region and Mexican 



sub-region. 

 CARNIVORA. 



* Hycenodoriidce. 



* Proviverridce. 



* ArctocyonidcE. 



RODENTIA. 



Sciuridae. Mainly Arctogseic, although species of Sciurus 



extend in Neogaea as far south as Paraguay. 

 Dipodidce. 

 Castorida. H. 



* Theridomyida. H. 

 Lagomyidce. H. 



UNGULATA. 



* Chceropotamidtz. 



* A nthracotheriida. 



* Ccenotheriidce. 



TraguhdcE. Extinct in N. America. 



Cervidae. The genus Cervus exclusively Arctogaeic. 



Bovida. Represented by Bos depressicornis in Celebes. 



* Lophiodontidce. 



* Palaotheriidce. 



Rhinocerotida. Extinct in W. Arctogaea. 



* Chalicotheriidce. 



* Titanotheriida*. Mainly W. Arctogaeic but occurring 



in the Balkans. 

 Elephantidae. Elephas. 



* CoryphodontidcK. 



