-xxxviii NATURAL HISTORY. 



very much in colour, according to age, some being entirely of a uniform blackish- 

 brown, and others more or less marked with lighter colours. 



A nest with two eggs was found near Fury Point, by the margin of a small lake. 



29.— LESTRIS PARASITICUS (Arctic Jager). 



LESTRIS PARASITICUS.— RicA ; Faun. Bor. Amer.— vol. ii., p. 430. Temm.— vol ii., p. 796. 



Sab: Trans. Linn. Soc. — vol.xii.,p.551. Supp.to Parry'sXst Voi/age—'p.ccvx. 

 Rich: App. to Parry's 2d Voyage — p. 361. Ross, App. to Parry's 3d 

 Voyage — p. 105; and App. to Parry's Polar Voyage — p. 196. 

 CATHARACTA PARASITICA— Fa6 .• Faun. Grwnl.— p. 103. 



The form and relative length of the central tail feathers of this bird vary so much 

 according to age and other circumstances, as to have induced the belief of the 

 existence of several distinct, but very nearly allied, species, and the differences 

 observed in the plumage of the immature birds, materially tended to strengthen this 

 idea. Temminck and Sabine were the first to point out the mistakes that preceding 

 authors had made, and by giving accurate descriptions of the bird in every state 

 of plumage from the egg to maturity, have prevented a recurrence of similar errors. 



30.— PROCELLARIA GLACIALIS {Fulmer Petrel). 



PROCELLARIA GLACIALIS.— remm.— vol. ii., p. 802. Lath : hid. Orn.—voX. ii., p. 823. 



Fab : Faun. Grasnl. — p. 86. Gmel. vol. i., p. 563. Sab : Supp, 

 to Parry's \st Voyage — p. ccvi. Ross, App. to Parry's 3ii 

 Voyage — p. 106 ; and App. to Parry's Polar Voyage — p. 196. 

 FULMER PETREL.— Xa<A : Syn.— vol iv., p. 403. Penn .- Arct. Zool.— vol ii., p. 534. Brit. 



Zool. — vol. ii., p. 203. 



Abounds in most parts of the North Atlantic Ocean, but is peculiarly numerous in 

 Hudson's Bay, Davis's Strait, and BaflSn's Bay. It is also occasionally met with to the 



