GUILLEMOT. NATATORES. URIA. 425 
lemot of our more southern coasts, and of which they dis- 
play all the essential characters. Mownracu’s error, there- 
fore, with respect to this bird, and also the Razor Bill, is to 
be entirely attributed to his want of information regarding 
the change that takes place in the adults immediately after 
incubation. The Guillemot is of a squat and thick shape, 
and of great weight, in proportion to its dimensions. It 
swims with much buoyancy, and is an excellent diver, in 
which occupation the greater part of its existence is passed. 
It shews but little apprehension of danger, frequently admit- 
ting the approach of a boat within oar’s length, from whence 
it has evidently obtained its trivial name. On account of the 
shortness of its wings, it rises with difficulty from the surface 
of the water, along which it skims for a short distance, but 
at arapid rate, in consequence of the quickly-repeated strokes 
of its pmions. During the breeding season it is generally 
compelled to make a circuitous flight before it can attain a 
sufficient elevation to reach the ledge of the rock selected 
for that purpose. 
PrLateE 79. represents the Adult Bird, in the summer or 
breeding plumage. 
Head, throat, and upper part of the neck, pitchy black ; General 
the feathers being small and very close set. From the er ; 
posterior angle of the eye is a streak or line formed by Adult bird. 
the division of the feathers. Dorsal plumage greyish- Peas 
black; in some tinged with brown. ‘Tips of the se- 
condaries, and the under plumage, white. Flanks streak- 
ed with blackish-grey. Legs brownish-black. Bill 
black ; in length from the forehead to its tip one inch 
and three quarters. Inside of the mouth fine saffron- 
yellow. . 
Throat, and sides of the neck, white; with a dark streak Winter 
behind the eye. Crown of the head, nape and back i Ni 
part of the neck, greyish-black. In other respects the 
same as in summer. 
