RECENT LAND MAMMALS OF WESTERN NORTH AMERICA 



143 



have used the excellent summary of fossil evidence by Simpson 

 (1947). 



LAND MAMMALS FOR WHICH LAND BRIDGE SERVED AS A 



CORRIDOR 



Moles (Family Talpidae). These animals must have required a 

 soil cover of the proper kind. This means also a vegetative cover 

 and soil organisms for food. Our western moles today range no 

 farther north than southern British Columbia. However, the eastern 

 representatives go well into Labrador. The present distribution, 



Fig. 2. General distribution of the moles, Family Talpidae, of North 

 America. Late crossings of the Bering land bridge are not indicated. 



