SULA.] AVES NATATORES. 263 



Birds, vol. n. p. 387. Crested Shag, or Green Cormorant, Selb. 

 Illust. vol. ii. p. 450. pi. 86. Gould, Europ. Birds, part x. 



DIMENS. Entire length twenty-eight inches : length of the bill (from 

 the forehead) two inches six lines, (from the gape) three inches six lines ; 

 of the tarsus two inches two lines ; of the tail five inches two lines ; from 

 the carpus to the end of the wing ten inches nine lines. 



DESCRIPT. (Adult in tointer.) The whole plumage of a rich deep 

 glossy green : upper part of the back, scapulars, and wing-coverts, with 

 bronze and purple reflections, each feather surrounded with a narrow 

 edging of velvet-black : tail short and rounded ; black : base of the bill 

 and guttural pouch gamboge-yellow: bill brown: irides green: legs 

 black. (Summer plumage.) Remarkable for an elegant crest of long 

 spreading feathers rising from the forehead between the eyes, capable 

 of erection : no white feathers on the neck and thighs as in the last 

 species. (Young of the year.) " Distinguished by the whole of the upper 

 part of the plumage being brown, slightly tinted with green ; the under 

 surface brownish ash, more or less inclining to white." GOULD. (Egg.) 

 White, tinged with pale greenish blue in patches; the outer surface 

 rough and calcareous : long. diam. two inches five lines; trans, diam. 

 one inch five lines. 



Found principally in the rocky islands of the North of England and 

 Scotland. Common in the Orkneys. Breeds on the shelves of steep 

 rocks. Nest formed of sea- weed. Eggs from three to five in number. 

 Feeds on fish. Is never seen inland. 



(24.) P. Graculus, Steph. in Shaw's Gen. Zool. vol. xui. part i. 

 p. 82. Carbo Graculus, Temm. Man. d'Orn. torn. n. p. 897. Black 

 Cormorant, Gould, Europ. Birds, part x. 



This species has been considered as British by nearly all our own Orni- 

 thologists, though upon very insufficient authority. It appears to have 

 been confounded with the P. cristatus, from which it differs in the darker 

 colour of its plumage, as well as in other characters which will be found 

 pointed out in Mr Gould's work above referred to. 



GEN. 107. SULA, Briss. 



280. S. Bassana, Briss. (Common Gannet.) Crown 

 and occiput pale buff; quills black ; the rest of the plumage 

 Avhite. 



S. alba, Temm. Man. d'Orn. torn. n. p. 905. Gannet, Mont. Orn. 

 Diet. 8f Supp. Bew. Brit. Birds, vol. u. p. 390. Solan Gannet, 

 Selb. Illust. vol. n. p. 455. pis. 86*, & 87. 



DIMENS. Entire length three feet. 



DESCRIPT. (Adult in perfect plumage.) Crown of the head, and 

 occiput, pale buff-yellow ; all the rest of the plumage milk-white, with 

 the exception of the quills and bastard winglet, which are black : bill 

 bluish gray at the base, the tip white : naked skin surrounding the eyes 

 pale blue : at the corners of the mouth a dusky membrane having the 

 appearance of being a prolongation of the gape: chin destitute of fea- 

 thers, and of a dusky colour; capable of great distention, forming a kind 

 of pouch : irides yellow : acrotarsia and acrodactyla with longitudinal 

 streaks of pale green; membranes dusky; claws white: tail-feathers 

 strong and pointed: twelve in number; the middle ones longest. (Young 



