j4 EGG CHECK LIST OF NORTH AMERICAN BIRDS. 
760. Black Guillemot — URIA GRYLLE. Varying from a pure pearl- 
white to a pale greenish-white, marked irregularly with spots and blotches 
of different shades of brown and black, thickest at the great end where 
they are usually almost a cenfluent ring; three; 2.40 by 1.60,v. 
Eggs are placed in holes of cliffs. Coast of North Pacific. 
63. Common Guillemot—LomvIA TROILE. White or greenish-white, 
spotted with dark-brown and umber, pyriform; one; 3.25 by I.90,v7. It 
is very abundant on the coast of Labrador, where on the low islands it 
breeds, laying its egg, like the Razor-billed Auk, on the bare rock or gravel. 
Northern Coasts of America. 
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