S70 ON THE DIFFERENT SPECIES OF 
MiNCK as merely an Arctic variety of it. It differs, how- 
ever, in the following particulars. The bill has little or no 
protuberance above, which the L. argenteus has, although 
in a slighter degree ; in L, argenteus, the upper mandible 
is very little longer than the under, in L. arcticus it is 
considerably ; the nostrils are linear in the former, in the 
latter much wider, and almost pyriform ; the wings are 
longer than the tail in argenteus, of equal length in arcti- 
cus ; in the former, the five first primaries are more or less 
brownish-black, as well as the shafts, the tips abruptly 
white ; in the latter they are whitish, the bluish colour of 
the base decreasing gradually, so that a large portion of 
the tips is pure white, as well as the shafts. There is a 
much more striking afiinity between the present and follow- 
ing species, than between it and the preceding : the distin- 
guishing characters will be pointed out in the next article. 
The young of this species are distinguished from those 
of the following, chiefly by their great inferiority in point 
of size ; they are distinguished from those of all the other 
great gulls by having no black on the quills or tail, by the 
greater lightness of the tints and markings, which agree 
with those of the following species. 
6. Larus glacialis. Greenland Gull. 
L. rostro inferne solum aucto, dorso alisque ccerulescenti- 
perlaceis, pennarum versus apicem spatio magno albo, 
prioribus quinque albescentibus, alis cauda breviori- 
bus (tarso digitoque 3 polhcum longis). 
Adult, Winter Plumage. — Beak longish, less compressed 
than in the preceding species, without gibbosity above, 
wine-yellow, diaphanous at the tip and edges, an orpiment- 
