340 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 

 Genera of the Forth American Region Continued. 



Summary. 



Whole number of genera 72 



Peculiar to the region 23 



Circumpolar 32 



Of general distribution throughout the region _ 26 



Occurring in the Cold Temperate Subregion 47 



Occurring in the Warm Temperate Subregion 53-56 



Land genera represented in the Eastern Province 47 



Genera represented in the Middle Province 51 



Land genera represented in the Western Province 48 



Land genera restricted to the Eastern Province *6 



Genera common to the Middle and Western Provinces not represented in the 



Eastern Province 8 



Genera restricted to the Middle Province 2 



Land genera restricted to the Western Province t3 



Maritime genera restricted to the Eastern Province 5 



Maritime genera restricted to the Western Province 5 



Maritime genera occurring in both Eastern and Western Provinces 1 



Plus 5 maritime = 11. 



t Plus 5 maritime = 7. 



