Bill longer than the head, opening beyond the eyes, straight, elongated, conical, moderately compressed; upper mandible, with the dorsal line, straight and declinate, at the end convex and a little decurved; the ridge very broad, convex, with a slight median carnia, and separated on each side from the sides, which are perpendicular, slightly convex, and have an additional narrow-jointed piece below the eye; edges sharp, direct, irregularly serrate with numerous slender cuts directed backwards, tip compressed, a little decurved, rather acute; lower mandible with the angle extremely long and narrow, the dorsal line straight, ascending, the sides erect, convex, the edges sharp and serrated, the tip compressed, acute. No external nostrils. Head large, neck of moderate length, and very thick; body of moderate bulk, rather elongated. Feet short, strong, placed rather far behind; tibiæ concealed; tarsus very short, rounded before, sharp behind, scaly, with three lines of small transversely oblong scutella, which run down the toes, the latter long and slender, all united by membranes having their margins straight; first toe rather small, directed inwards and forwards; middle toe longest, the outer almost equal. Claws of moderate size, slightly arched, that of the third toe pectinate. Plumage generally close, rather compact, on the head and neck blended. Wings very long, narrow, acute; first quill longest. Tail rather long, cuneate, of twelve or fourteen feathers. Gular sac small, with a small median portion bare; tongue extremely small, blunt; œsophagus extremely wide; proventricular glands forming a broad belt partially divided by intervals; stomach extremely small, its muscular coat thin, the inner soft; intestine of moderate length, slender; cœca very small; cloaca globular. 425. 1. Sula Bassana, Linn. Common Gannet. Plate CCCXXVI. Adult Male, and Young. Adult with the bill pale bluish-grey, tinged with green towards the base; bare space about the eye, lines on the bill and gular membrane blackish-blue; tarsi, toes, and webs, brownish-black, the scutella light greenish-blue, claws greyish-white; general colour of plumage white; upper part of head and hind neck buff-coloured; primary quills brownish-black, their shafts white toward the base. Young at first covered with very soft white down; when fully fledged, with the bill light greyish-brown, the bare space around the eye pale greyish-blue; feet dusky, the narrow bands of scutella pale greyish-blue; head, neck, and upper parts, chocolate-brown, each feather with a terminal narrow triangular white spot; lower parts greyish-white, spotted with greyish-brown, each feather having a broad terminal margin of that colour; quills and tail-feathers brownish-black. _Adult_, 40-1/2, 75. _Young_ fledged, 38, 72. Ranges southward off the coast at all seasons as far as the Gulf of Mexico. Breeds on rocks on the Gulf of St Lawrence, and off the coast of Labrador. Abundant. Migratory.