ZOOLOGY. 
CClll 
for the northern species. Two immature specimens of the S. Arctica were 
killed on the 8th of July from amongst a large flock of full-plumaged birds, 
and may supply a description of a bird of the first year; bill black, the lower 
mandible having a reddish tinge, especially near the edges, and at the base ; 
forehead, throat, neck, and inferior plumage, white, very slightly tinged on 
the breast and belly with a faint ash-colour. The cap mottled black and 
white, the upper plumage ash-colour, the wing coverts indistinctly mot- 
tled with brown, the outer web of the first primary quill feather velvet 
black at the base, shading into ash-colour towards the point, a portion of the 
inner webs near the shaft is of a deeper shade than the remainder ; the outer 
feathers of the tail exceed the middle ones in length three inches ; the scapu- 
lars and secondaries tipped white ; the colour of the legs in process of change 
from black to red. 
The middle claw of this species, as well as of the S. Hirundo, is much longer 
than the other claws, and is curved laterally outwards. 
16. Larus Glaucus. Qlaucus Gull. 
Greenl. Birds, no. \ 9. Temm. 757. 
This fine species of gull is as numerous in the Polar Sea, as in Baffin’s Bay 
and Davis’ Strait, occupying with their nests the pinnacles of rocks and the pro- 
jecting ledges of cliffs on the sea-shore. In the Memoir on the Greenland Birds, 
it is stated to be somewhat inferior in size to the L. Marinus, whereas in 
Temminck’s second edition, the Glaucus is called the largest of known gulls. 
In comparing the size of many specimens of both species, the average is in 
favour of the Marinus ; but by far the largest individual of either is a Glaucus 
killed on the north shore of Barrow’s Strait, being in length 32 inches, in ex- 
tent 65 inches, and weighing 4 lbs. 3 ozs. The tarsus was 3.4 inches, and 
the bill exceeded 4 inches, prodigiously strong and arched ; the upper man- 
dible overhooking the lower more than is customary. It was a male bird. 
