ZOOLOGY. 
CCIX 
on the 22d of June, corresponds precisely with Mr. Temminck’s male of one 
or two years old. 
29. CoLYMBUs Septentrionalis. Red-throated Diver. 
GreeiiL Birds, no. 16 , Temm. 916 . 
Breeds in the neighbourhood of fresh water-ponds on the shores of Baffin’s 
Bay and Davis’ Strait. The young birds, killed in September, were in 
the plumage in which they have been called C. Stellatus. But when nest- 
lings, the feathers of the back, scapulars, and wing coverts were margined 
with white. 
30. Uria Brunnichii. Brunnich's Guillemot. 
Greenl. Birds, no. 14 . Temm. 924 . 
In the account of this species in the Memoir of the Greenland Birds, an 
inference was drawn that it undergoes the same changes of plumage from 
season as the U. Troile. This inference has been subsequently confirmed ; 
the specimens which were killed early in June having the throat and neck 
white, unmixed with black. Towards the end of June the change was in pro- 
gress ; and, by the second week in July, as many were found in perfect 
summer plumage, with black throats and necks, as were still in change. 
In Temminck’s second edition he has omitted to notice the yellow margin 
of the upper mandible of the bill, a peculiarity which serves well to distin- 
guish this species from the U. Troile. In the living bird, and in the height 
of the summer season, the colour is a deep yellow ; though in preserved 
specimens it appears much fainter, and approaching to horn. Both the Uria 
Troile and Briinnichii are found on the shores of the northern seas of Europe ; 
but the Troile is not known to inhabit those of North America. 
31, Uria Grylle. Black Guillemot. 
Greenl. Birds, no. 15 . Temm. 925 . 
These birds, which are so numerous in Davis’ Strait and Baffin’s Bay, 
were rarely seen in the Polar Sea. 
