232 
RAZOR-BILL AUK. 
and sides of the head, as well as the under parts, 
are white, the light colour passing over nearly to 
the occiput, where it is very slightly clouded, and 
the feathers become gradually purer, the tips for a 
certain space only being dark. A specimen in this 
state is before us, shot in winter, and showing the 
breadth of the bill not developed. We possess 
another, where the breadth of the bill is greater, but 
the white marking is not complete ; the plumage of 
the head and neck darker, and with white mixed, 
as if the adult breeding state was still in progress. 
The next form is a very remarkable one, where 
the bill, in comparison with the size of the bird, is 
