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the coasts of Western Europe. An adult bird in 
summer plumage, with fine black head, was killed 
on the Shannon, in Ireland, the only specimen in that 
state of plumage obtained in the British Islands. 
Professor Nilson says that this species is a summer 
visitor to the marshes in the vicinity of the Baltic 
and Gothland, where it breeds, but he has never 
seen the eggs. It is also said to be found in 
Germany, Holland, Russia, Siberia, &c. 
GULL, MASKED. 
Larus cApistratus, Temm. 
Two specimens of this bird, a male and a female, 
from Orkney, were in Mr. Bullock’s collection; 
and another, from Shetland, was presented in 1831 
to the Zoological Society of London. In March, 
1833, one was shot near Belfast, and two others 
have been mentioned as having been either cap- 
tured or shot. This bird, first described as a 
species by Temminck, is said to be smaller than 
the common Black-headed Gull, with shorter and 
more slender bill, and shorter legs. 
GULL, POMARINE SKUA. 
LESTRIS POMARINUS, TZemm. 
This species, which is smaller than the Common 
Skua, breeds in the Arctic regions, and appears 
