122 MR. J. E. HARTING ON ARCTIC BIRDS. [Feb. 7, 



Alca cirrhata, Gmelin, Syst. Nat. i. p. 553; Pallas, Spic. Zool. 

 v. p. 7. 



Mormon cirrhatus, Bon. Syn. 429 ; Baird, Birds N. Amer. p. 902. 



Two from the same source as the last mentioned. 



The Tufted Puffin is one of the most abundant species of this 

 family on the coasts of Western and North-western America. It is 

 easily recognized by the pendent crest-like feathers on each side of 

 the head, and seems to form a connecting-link between Mormon 

 and Phaleris. 



Cases 35 & 36. Ivory Gull. 



Larus eburneus, Gmelin, Syst. Nat. i. p. 596 ; Rich. & Swains. 

 Faun. Bor.-Amer. ii. p. 419. 



Distinguishable in the adult state by its entirely white plumage, 

 yellow bill, and black legs. The two specimens here exhibited 

 were taken in 1851, in Assistance Harbour, Barrow Straits, 74^° N. 

 lat., 74|° W. long., by Mr. Abernethy, ice-master to H.M.S. ' Felix.' 



Case 37. Western Gull. 



Larus Occident alis, Audubon, Orn. Biog. v. p. 320 ; Baird, Birds 

 N. Amer. p. 845. 



One, killed on Choris Peninsula, Behring's Straits, in 1849, by 

 Captain Moore, H.M.S. ' Plover.' 



This species, of which the habitat is the north-west coast of Ame- 

 rica, is equal in size to Larus argentatus, but has a shorter wing, 

 and is distinguishable by its much darker mantle. 



Case 38. Glaucous Gull. 



Larus glaucus, Briinnich, Orn. Bor. p. 44 ; Rich. & Swains. Faun. 

 Bor.-Amer. ii. p. 416 ; Baird, Birds N. Amer. p. 842. 



Shot by Sir Leopold M'Clintock on Melville Island. 



Individuals of this arctic species vary considerably in size. The 

 young have the upper portion of the plumage yellowish white, 

 mottled with pale brown ; the underparts grey ; the tail white, 

 irregularly spotted with pale brown ; bill yellow with tip horn-colour. 

 It is in this plumage usually that we find the examples which are 

 procured in Great Britain. 



Case 39. Sabine's Gull. 



Larus sabinii, Sabine, Trans. Linn. Soc. xii. p. 520, pi. 29 (1818) ; 

 Greenl. Birds, p. 551. no. 23 ; Richardson, Append. Parry's Second 

 Voy. p. 360; Richards. & Swains. Faun. Bor.-Amer. p. 428. 



Specimens of this bird in summer plumage are very rare in col- 

 lections. The species was discovered by Capt. Sabine at its breed- 

 ing-station on some low rocky islands off the coast of Greenland. 

 He subsequently procured a pair at Spitzbergen. It was found in 

 Prince Regent's Inlet during Sir Edward Parry's first voyage ; and 

 during his second voyage several specimens were obtained on Melville 

 Peninsula. 



