56 Proceedings of the Royal Physical Society. 



Until put right by Sir Wm. Jardine, I confounded the single 

 specimen received of this species with the Oidemia fusca. or vel- 

 vet scoter of Britain and Europe, to which it is very closely 

 allied — the specific differences consisting in the proportions 

 of the bill, the form of the tuberosity on it, and in the white 

 spot under the eye being larger, and extending in a narrow 

 circle partially round the eyelids. Sir William suggests that 

 both the American and European bird may range in each con- 

 tinent, and that we may find the American form here, or if 

 not, that it is just one of those very close forms which requires 

 farther examination to enable us to say whether it is an ex- 

 tent of variation only, or really a distinct species. 



Oidemia Americana (Linn.) ; Trout Lake. 

 Mergus serrator (Linn.); Trout Lake, Severn House. 

 Mergus cucullatus (Linn.) ; Hudson's Bay, Trout Lake. 

 Peleeanus erythrorhynchus (Gmel.) ; Hudson's Bay. 

 Lotus zonorhynclius (Rich, and Sw.) (?) ; Hudson's Bay. 



Sir Wm. Jardine remarks that in any specimens or 

 figures of the L. zonorhynclius which he has seen, the black 

 mark on the bill is at some distance from the tip, which is 

 not the case in this specimen. It does not agree with any 

 other, therefore, most probably, is a variety of this species. 



Larus argentatus (Gmel.) ; Severn House. 

 Lestris cepkus, Brunnich 1764 (Buffonii, Yarr.) ; Moose 

 Factory. 



Xema Bonapartii (Bich, and Sw.) ; Severn House. 



Fortunately several specimens of this gull have been re- 

 ceived. It is rare in collections, but would appear not to be 

 so in Hudson's Bay. 



Sterna Hirundo (Linn.), (Common Tern.) ; Hudson's Bay. 

 Sterna arctica (Temm.) ; Moose Factory and Trout Lake. 

 Sterna nigra (Linn.) ; Moose Factory, and Severn House. 

 Uria grylle (Lath.), (Black Guillemot.) ; Severn House. 

 Podiceps cornutus (Linn.) (Horned Grebe) ; Trout Lake. 



The band on the head and cheeks is much paler in the 

 specimen received than in European specimens. 



Colymbus arcticus (Linn.), (Black- throated Diver); Severn House. 

 Colymbus glacialis (Linn.), (Great Northern Diver); Severn House. 



