LYMNyEID.E OF NORTH AMERICA. 



57 



Fig. 1. 

 Map of North America showing faunal regions. 1, Labradorian; 2, Can- 

 adian; 3, Hudsonian; 4, Mackenzian ; 5, Yukonian; 6, Alaskan; 7, Columbian; 

 8, Coloradoan; 9, Great Basin; 10, Californian; 11, Rio Grandian; 12, Upper 

 Mississippian; 13, Lower Mississippian; 14, Carolinian; 15, Nova Scotian ; 16, 

 Central American; 17, West Indian; 18, Greenlandian. 



