ccxxii GENER-AL INDEX. 
VOL. 
GENUS PROCELLARIA. 
Bill hard, sharp-edged, depressed and dilated at the 
base, compressed and hooked at the point ; nostrils pro- 
minent, for the most part contained in one tube, in some 
species distinct and separate ; feet of a middling length, 
slender, tarsus compressed, the three anterior toes long, 
back toe a mere spur ; wings long and strong. 
American Stormy Petrel, (P. Wikonii) - vii 
GENUS ANAS. 
Bill of middling length, convex, covered with a 
thin skin, generally depi’essed at the point, which is ob- 
tuse and nailed, the edges of both mandibles divided in- 
to lamellae or teeth ; nostrils placed near the summit of 
the bill and suboval ; tibia feathered as far as the knees ; 
feet short, the three forward toes entirely palmated, the 
hind toe solitary. 
FIRST SECTION. 
Geese. 
Bill shorter than the head, the lamellae of its edges 
conic ; tail of middling length. 
Brant, {Jl. bernicla) - - - . viii 
Canada Goose, {Jl. Canadensis) - - - viii 
Snow G. (Jl. hyperborea) - - - viii 
Young female of ditto - - - viii 
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