2IS 
BRITISH BIRDS, 
^BLACK-BACKED GULL, 
OR, GREAT BLACK AND WHITE GULL. 
( Lams marlnus, Lin . — Le Gotland noiry BufF.) 
This fpecies, which is the largeft of the tribe, 
meafures twenty-nine inches in length, and five feet 
nine inches in breadth, and weighs nearly five 
pounds. The bill is pale yellow, very firm, ftrong, 
and thick, and nearly four inches long from the tip 
to the corners of the mouth : the projecting angle 
on the lower mandible is red, or orange, with a 
black fpot in the middle, on each fide : the irides 
are yellow, and the edges of the eye-lids orange. 
The upper part of the back and wings are black % 
