ZOOLOGY. 
CCV 
which is so common in Davis’ Strait and Baffin’s Bay, was rarely seen in the 
Polar Sea, on account, probably, of there being less open water, and conse- 
quently greater difficulty in obtaining a supply of food. 
19. Larus Tridactylus. Kittiwake Gull. 
Greenl, Birds, no. 22. Temm. 774. 
These, like the preceding species, were very rarely seen in the Polar Sea ; 
so late in the season as the 17th of July, an immature bird was killed in 
Davis’ Strait, having very slight remains of the circle round the neck, and of 
the mottled head, but retaining the markings of immaturity on the coverts of 
the wing.s, and at the tips of the tail feathers, as decidedly as in winter 
specimens. Adult specimens had been killed on the eighth of July, in the 
perfect plumage of summer. 
20. Larus Sab ini. Pork -tailed Gull. 
Greenl. Birds, no. 23. 
One of these gulls was seen on the wing in Prince Regent’s Inlet in 
August, and was pursued, but without success ; it was, however, identified 
with certainty by the persons who had been present on the former Voyage, 
when they were first met with. 
The history of this species presents a remarkable instance of confined 
locality ; in the account which is referred to, it is stated to have been found on 
three small islands in Baffin’s Bay in latitude 75|°, breeding in great numbers 
in company with terns, and to have been previously unknown to Saccheus, the 
Esquimaux interpreter, who was well acquainted with the birds of his native 
country, namely,- of Greenland south of Disco, where it is therefore pre- 
sumed to be unknown ; there are few parts of the coasts of Baffin’s Bay or of 
Davis’ Strait, which have not been visited by either the present or the former 
Expedition, but in no instance have these birds been met with before or 
since, with the exception of the one individual in Prince Regent’s Inlet ; their 
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