428 
BRITISH SPECIES UNKNOWN AS IRISH. 
Three others have been twice procured in Great Britain 
Bulwer's tern, discovered in Madeira, and believed to be found 
about the Canary Islands ; — Steller's western duck, a native of 
the more northern parts of Europe, Asia, and America;* — and 
buffel-headed duck, a North American species. 
Eive others have been very seldom met with ; — bimaculated 
duck, a bird of Northern Asia ; very little is known respecting it 
in any country; — red-crested whistling duck, belonging to the 
eastern and more southern half of Europe, part of Asia, and North 
Africa ; — harlequin duck, a northern species of Europe and Ame- 
rica; — laughing gull, a North American bird, found also along 
the southern coasts of Europe ; — and Wilson's petrel, an inhabi- 
tant chiefly of the North American seas. 
Two species found only in the eastern hemisphere (in Europe, 
Asia, and Africa), are occasional visitants to England, which is the 
western limit of their migration. These are the ferruginous or 
Nyroca duck, and Caspian tern, both of which have been chiefly 
met with in the east of England. 
What has been said of the last two is equally applicable to the 
gull-billed tern, with the addition that it is now considered iden- 
tical with a North American species, the S. aranea of Wilson. 
The remaining two have only of late years been recognized as 
distinct species, hence their geographical distribution has yet to be 
learned. These are the Polish swan, which has been procured on 
the Baltic Sea and the eastern coast of England ; and the pink- 
footed goose in Erance, Holland, and Belgium, as well as Eng- 
land and Scotland. 
Of the preceding sixteen species, three only have been obtained 
in Scotland (Jard. ; Macg. ; Yarr.) ; — pink-footed goose, harle- 
quin duck, and buffel-headed duck. The Nyroca duck was once 
procured by Sir William Jardine, in Edinburgh market, but it 
was not known where it had been killed. 
It is considered unnecessary to go over the same ground 
here in drawing inferences from the geographical distribution 
* At p. 118, the second individual (obtained since the publication of the 2nd edi- 
tion of Yarrell’s work) has been noticed. 
