566 SNOW GOOSE. 
great regret of my family, as I had anticipated the pleasure of present- 
ing it alive to my honoured and noble friend the Earr. of Derby. 
There can be little doubt that this species breeds in its grey plu- 
mage, when it is generally known by the name of Blue-winged Goose, 
as is the case with the young of Grus Americana, formerly considered 
as a distinct species, and named Grus Canadensis. 
ANAS HYPERBOREA, Grmel. Syst. Nat. vol. i. p. 504.—Lath. Ind. Orn. vol. ii. p. 837. 
Snow Goosr, Anas HyPERBOREA, Wils. Amer. Ornith. vol. viii. p. 76, pl. 68, fig. 3, 
Male, and p. 89, pl. 69, fig. 5, Young. 
ANSER HYPERBOREUS, Ch. Bonaparte, Synopsis of Birds of United States, p. 376. 
ANSER HYPERBOREUS, Snow Goose, Richards. and Swains. Fauna Bor.-Amer. 
vol. ii. p. 467. 
Snow Goose, Nuttall, Manual, vol. ii. p. 344. 
Adult Male. Plate CCCLXXXI. Fig. 1. 
Bill about the length of the head, much higher than broad at the 
base, somewhat conical, compressed, rounded at the tip. Upper man- 
dible with the dorsal line sloping, the ridge broad and flattened at 
the base, narrowed towards the unguis, which is roundish and very 
convex, the edges beset with compressed, hard teeth-like lamellz, their 
outline ascending and slightly arched ; lower mandible ascending, nearly 
straight, the angle long and of moderate length, the dorsal line beyond 
it convex, the sides erect, and beset with lamelle similar to those of 
the upper, but more numerous, the unguis obovate and very convex. 
Nasal groove oblong, parallel to the ridge, filled by the soft membrane 
of the bill; nostrils medial, lateral, longitudinal, narrow-elliptical, open, 
pervious. 
Head of moderate size, oblong, compressed. Neck rather long and 
slender. Body full, slightly depressed. Feet rather short, strong, 
placed about the centre of the body ; legs bare a little above the joint ; 
tarsus rather short, strong, a little compressed, covered all round with 
hexagonal, reticulated scales, which are smaller behind ; hind toe very 
small, with a narrow membrane’; third toe longest, fourth considerably 
shorter, but longer than the second; all the toes reticulated above 
at the base, but with narrow transverse scutella towards the end; the 
three anterior connected by a reticulated membrane, the outer having 
a thick margin, the inner with the margin extended into a two-lobed 
web. Claws small, arched, rather compressed, obtuse, that of the 
middle toe bent obliquely outwards, and depressed, with a curved edge. 
