SULIDA., — CXXXI. 225 
c. Tarsus moderate, much longer than hind toe with claw. 
d. Bill compressed; gular sac small. . . PHALACKOCORACIDA, 133. 
dd. Bill much flattened; gular sac very large. . PELECANIDA, 134, 
cc, Tarsus extremely short, not longer than hind toe with claw; wings 
and tail excessively long, the latter deeply forked. 
: FREGATID&, 135. 
Famity CXXXI. SULIDAN. (Tue Gannerts.) 
Bill long, cleft to beyond eyes, very stout at base, the tip not 
hooked, the tomia irregularly serrate ; a nasal groove, but the nos- 
tril abortive; gular sac small, naked; wings long, pointed; tail 
long and stiff, with pointed feathers; feet stout. Body heavy, 
similar to that of a goose, the tissues under the skin with air- 
chambers as in the Pelicans. One genus with 5 or 6 species. 
Gregarious sea-birds, found in most regions. 
344. SULA Brisson. (French, Sule.) 
a. Lower jaw, chin and throat densely feathered. (Dysporus.) 
678. S. bassana L. GANNET. White, black on wings; yellow- 
ish on head ; young dark brown, spotted. L. 36. W. 20. T. 10. 
B. 6. N. Atl, S. to Florida, common N. (£u.) (From Bass 
Rock, Eng., where Gannets breed.) 
Famity CXXXII ANHINGIDAS. (Tue Danrrters.) 
Bill very long, straight, slender, sharp, the tomia finely serrate ; 
gular sac small, naked ; nostrils minute, becoming obsolete ; tail long, 
stiff, fan-shaped, when spread, the feathers broad, the middle pair 
in the adult transversely corrugated. Neck long, very slender, the 
vertebrae (20 in number) of peculiar structure; feet short, far 
back. A single genus, with 3 or 4 species; swift, wary birds, their 
movements in the water resembling those of a snake. 
345. ANHINGA Brisson. (Port., anhina; Lat., anguina, snaky.) 
679. A. anhinga(L.). Darter. SNAKE-BIRD. WaTER TurR- 
KEY. Chiefly black, with greenish lustre above; neck with hair- 
like plumes ; ? largely buffy, back with pale streaks. L.35. W. 
14. T.11. B. 31. Tropical Am., N. to §. IU. 
Famiry CXXXIU. PHALACROCORACIDAL, (THE 
CorMORANTS.) 
Bill slender, about as long as head, nearly terete, but compressed, 
strongly hooked, the cutting edges uneven; gular pouch small. 
Wings short; tail very large, almost scansorial, of very stiff feath- 
ers, often used as a support for the body; legs set far back; a 
nasal groove with abortive nostrils. Colors in both sexes lustrous, 
iridescent black ; in the breeding season usually with long, white, 
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