MONOGRAPH OF THE PETRELS. 



five collected in Kerguelen by the Rev. A. E. Eaton vary from a broad oval to an 

 elliptical form, some are smooth and plain white, others, however, are marked with 

 numerous very minute rufous dots over the greater portion of the shell. 



Adult. General colour above greyish-blue, the longer scapulars darker grey 

 towards the ends, with pearly-grey or white edges ; wing-coverts like the back, with 

 the marginal and lesser coverts ashy-black, like the adjoining scapulars, the greater 

 series edged with hoary-white ; bastard-wing blackish ; primary-coverts ashy black ; 

 primaries blackish externally, the inner webs hoary-white, shading into grey 

 towards the ends, which are black ; inner primaries and secondaries greyish-blue with 

 black shafts, the inner webs for the most part white, the secondaries also edged 

 externally with white ; lower back, rump, upper tail-coverts and tail-feathers greyish- 

 blue like the back ; the tail-feathers broadly tipped with white, before which is a sub- 

 terminal shade of ashy-black ; crown of head, nape, and hinder-neck, as well as the 

 sides of the latter, slaty-black, extending in front of the eye and below the latter, and 

 along the upper line of the ear-coverts ; forehead, lores, sides of face, and ear-coverts, 

 pure white, the feathers between the forehead and the vertex mottled with black centres 

 and white margins to the feathers ; entire under-surface of body pure white, the sides 

 of the chest and upper breast greyish-blue like the back ; under wing-coverts, axillaries, 

 and quill-linings pure white ; " bill dull blackish-brown, with a stripe of blue-grey along 

 the lower part of the lower mandible ; tarsus and toes delicate blue, interdigital 

 membrane fleshy- white, traversed with red veins " (J. Gould). Total length, 11.0 

 inches ; culmen, 1.1 ; wing, 8.3 ; tail, 3.7 ; tarsus, 1.3 ; middle toe and claw, 1.55. 



The description and figure of this bird are taken from a specimen procured near 

 Cape Horn, formerly in our collection, and now in the British Museum. 



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