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32 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
* Group 5. Wing, over 8.50 inches long. 
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Auk. \ 
Head and neck, black, easily distinguished — 
by the shape of the bill; a white line on bill. 
Alca torda. Razor-billed Auk. 
See No. 15. 
la 
Auk, 
[on rc 
Head and neck, sooty browns; bill pointed, no white line on bill. Uria troile. Murre. 
See No. 13. 
* For directions for measurement, see page 9. 
