IVORY GULL. 
310 
frequent, reaching southward to Spain and to Tre- 
bisond. A bird under the same name is also intro- 
duced in the Northern Zoology, which is said to 
spread northward as far as Arctic America, breeding 
there and retiring southward when the winter sets 
in. 
In the summer or breeding state, the head, neck, 
the rump and tail, and all the under surface of the 
bird are pure white, the mantle, scapulars and wing- 
-overs pearl grey, quills black with white tips ; the 
bill is greyish green passing into yellow at the tip ; 
eyelids vermilion red ; legs and feet greenish grey. 
In winter, the head, sides of the neck and nape, 
are streaked with brocoli-brown. 
The young have the upper plumage clove-brown, 
the feathers margined with greyish white ; under- 
neath they are clouded with a paler brown, the degree 
varying with age ; quills blackish grey ; the basal 
part of the tail white, with the other part black, 
tipped w T ith greyish white. 
In the two birds which follow, the form slightly 
varies, in the first the feet are more tern-like, the 
webs deeply cut ; while the second, a truly mari- 
time bird, leads to the petrels. 
The Ivory Gull, Larus Eburneus. — Larus 
candidus, Flem. — Mouetle blanche ou sancteur, 
Temm. — Ivory Gull of British authors . — It is to 
Mr. Edmondstone also that we are indebted for the 
first notice of the Ivory Gull as a British bird, the 
