STEGANOPODES. 73 
Orver STEGANOPODES.—The Torrrat- 
MATE SWIMMERS. (Page 1.) 
Families. 
a’. Nostrils distinct ; lateral toes nearly equal, and nearly as long as the middle 
one; whole head feathered. 
Bill conical, compressed, pointed, without terminal hook, or unguis; 
culmen curved ; edge of upper mandible very concave; tail short, gradu- 
ated, the middle pair of feathers, in adults, very narrow and greatly 
CON GATE. si. Fs sidicssaesssuncuuceeecneereascnechisedce Phaéthontidz. (Page 73.) 
a, Nostrils not perceptible; lateral toes unequal, and one or the other of them 
much shorter than the middle one; head partly naked. 
o'. Bill conical, the tip of the upper mandible without distinct hook, or 
upguis. 
ce. Bill very thick through the base, the tip slightly curved; tail about 
half as long as the wing, graduated or cuneate, the feathers narrow- 
ing toward the rather pointed tips... Sulidz. (Page 74.) 
c, Bill slender, the outlines (culmen especially) nearly straight; head 
very small, the neck extremely long and slender; tail nearly as long 
as the wing, rounded (fan-shaped when spread), the feathers very 
broad, the middle pair transversely corrugated in the adult. 
Anhingidz. (Page 76.) 
b%. Upper mandible terminated by a distinct hook, or unguis. 
ce, Tarsus moderately lengthened, much longer than the hind toe, including 
its claw. 
d', Bill shorter than middle toe, compressed; gular sac small, scarcely 
distensible; outer toe much longer than middle. 
Phalacrocoracidz. (Page 77.) 
d?, Bill much longer than middle toe, much flattened ; gular pouch very 
large, and greatly distensible; outer toe shorter than middle. 
Pelecanidz. (Page 81.) 
@, Tarsus excessively short, hardly equalling the hind toe (including its 
claw) in length. 
Wings and tail excessively lengthened, the latter deeply forked ; 
middle toe much longer than the outer, its claw flattened and 
fringed on inner edge; webs very small, occupying less than 
half the space between the toes........ Fregatidz. (Page 82.) 
Famiy PHAETHONTIDA2.—Tue Troric Birps. (Page 73.) 
Genera. 
(Characters same as those of the Family)....se00+ ..... Phaéthon. (Page 74.) 
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