PROCELLARIIDM. 81 



and the throat speckled with grey. Crown of the head and all the upper surface, slate-grey ; 

 the feathers of the forehead margined with white ; wings dark brown ; before and beneath the 

 eye a mark of brownish black ; face, throat, and all the under surface, pure white, interrupted 

 by the slate-grey of the upper surface advancing upon the side of the chest, and forming a 

 faint band across the breast ; centre tail-feathers dark grey ; outer feathers greyish white, 

 freckled with dark grey ; bill black ; tarsi, base of the toes, and basal half of the iuterdigital 

 membrane, pale fleshy white, the remainder black. Total length, thirteen inches and a half ; 

 bill, one inch and one-eighth; wing, nine inches and three-quarters ; tail, five inches ; tarsi, 

 one inch and five-eighths ; middle toe and nail, seven-eighths of an inch." This is probably 

 Procellaria roulensis of the Natural History Museum. A specimen was obtained by H.M.S. 

 'Challenger' in Nightingale Island: — "Eyes hazel; light bird ; 17th Oct., 1875." In Lord 

 Lindsay's Expedition, at the Island of Trinadad they knocked them down with sticks. 



White-winged Petrel {^Estrelata leucoptera). — This bird is thus described by Gould : — 

 '• The sexes do not differ in external appearance. Crown of the head, all the upper surface, 

 and wings, dark slaty-black ; tail slate-grey ; greater wing-coverts slightly fringed with white ; 

 face, throat, all the under surface, the base of the inner webs of the primaries and secondaries, 

 and a line along the inner edge of the shoulder, pure white ; bill black ; tarsus and basal half 

 of the iuterdigital membrane, fleshy-white ; remainder of the toes and iuterdigital membrane, 

 black. Total length, thirteen inches ; bill, one inch and five lines ; wing, eight inches and a 

 half; tail, four inches ; tarsi, one inch and one-eighth; middle toe and nail, one inch and 

 three-eighths." 



Cook's Petrel (^Estrelata Cooki). — Thus described by Mr. Gray, in Gould's 'Birds of 

 Australia ' : — "Grey above, with the apex of each feather narrowly margined, as well as their 

 bases, white ; oblong spot below each eye, wing-coverts, secondaries, and quills, brownish 

 black, with the basal portion of the inner webs of the two last white ; the front cheeks, under 

 wing-coverts, and the whole of the under part, white ; bill black ; tarsi and knee brownish 

 yellow ; feet black, with the intermediate webs yellow. Total length, twelve inches and a half; 

 biU, length one inch and seven lines, depth in middle three lines and a half; wings, two 

 inches and a quarter; tarsi, one inch and two lines." A specimen in the Natural History 

 Museum, called Procellaria Cooki, is well shown with its wings partly extended. 



Blue Petrel (Halobcena cazrulea). — Gould says,—" This bird may be distinguished from 

 every other of the smaller Petrels by the conspicuous white tips of the centre tail-feathers." 

 He thus describes it: — •" Forehead, lores, cheeks, throat, centre of the chest, and all the under 

 surface, white ; narrow space beneath the eye, shoulders, and the outer webs of the first 



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