MONOGRAPH OF THE PETRELS. 



the wing ; quills dusky, the inner webs whitish towards the base ; " bill, feet, and 

 iris black " (Gould). 



Total length, about 7 inches ; culmen, 0.5 ; wing, 5.05 ; tail, 2.65 ; tarsus, 

 1.15 ; middle toe and claw, 1.05. 



Young. Differs from the adult in having hoary-white margins to the feathers of 

 the back and scapulars, as well as the upper wing-coverts and tail-coverts, the latter 

 thus showing a dusky black sub-terminal bar. 



The bird described is a female specimen from Royal Sound, Kerguelen Island, in 

 the British Museum ; and the specimen figured is one from the Falkland Islands in 

 our collection. 



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