8O GEOGRAPHICAL DISTRIBUTION 



Brought forward . .125 



Palaearctic . . . . . .110 



West Palagarctic 



East to 110 25 



East to 85 29 



East to 70 . . . . .45 



East to 60 . . .4 



East to 50 , . . . .19 



East to 25 . .. . . .2 

 Not east of 10 D . . . . 10 



134 

 East Paleearctic ...... 9 



Central Palasarctic . . 13 



391 



ClRCUMPOLAR AND ClRCUMTROPIC SPECIES. 



There are no fewer than sixty-nine species of British Birds 

 whose breeding range may be regarded as cifcumpolar or circum- 

 tropical. They may be classified according to the climatic range 

 of their breeding-grounds as follows : 



Arctic 31 



Arctic and subarctic . . . . .12 



Arctic, subarctic, and subtropic ... 3 

 Subarctic and subtropic . . . 8 



Subarctic, subtropic, and tropic . . .3 

 Subtropic and tropic ...... 1 



Tropic 11 



69 



Of the thirty-one Arctic species, the first two breed in some 

 numbers within the limits of our Islands, the next three in much 

 smaller numbers, and the next two occasionally : 



Tetrao mutus. 

 Fulmarus glacialis. 



