"Ks 



EVOLUTION 



.oei „ 



J5t. 



s^> 



^l 



aalge 



'J-geTnortm<i- 



^ 



aalge axil^e aalge spiloptera ' 



•^ 



"^ 



«fc> 



iQ. 



^axilge udermedi 



aalge albionis 



ao- 



47 



Fig. 8 

 Breeding distribution of two closely-related guillemots or murres: Uria 

 W^^, the common guillemot ; and U.lomvia, the arctic guillemot (Briinnich's 

 guillemot* in the Atlantic, Pallas's murre in the Pacific). Areas of over- 

 lap shaded. 



on Bear Island (and often to be seen at sea in the Rockall area), and 

 the situation among the fulmars is therefore one not of dimorphism 

 but of polymorphism, as it is among the skuas. 



♦The Briinnich's guillemot, U. lomvia, does nest in Newfoundland on Funk Island 

 on a little island on the east side of the Avalon Peninsula just south of St. John's 

 (Green Island in Witless Bay) and on Cape St. Mary, S. W. Avalon. These colonies 

 were discoved by Leslie Tuck; the last in company with J. F. in April 1953, too late 

 to alter the map. 



