POLISH SWAN. 
97 
size, and by the colouring of the bill, which has the 
greater part of its terminal portion black, the orange 
at the base assuming nearly the form of an oval spot 
carried out to the eye. This species has also a con- 
volution of the trachea within the sternum, but it 
enters the cavity outside the os furcatorius, and the 
bronchial divarications are very short. 
POLISH SWAN, 
Cytjnus immuiabilis, Yariieia, 
PLATE II.* Fig. 3, 
Appears to have been first brought into notice 
as a British bird by Mr. Yarrell in 1838, who 
exhibited a specimen to the Zoological Society. 
He states, that during the severe weather of the 
winter of that year, “ several flocks of these Po- 
lish Swans were seen pursuing a southern course 
along the line of our north-east coast from Scot- 
land to the mouth of the Thames, and several spe- 
cimens were obtained.” Four were shot out of a 
flock of thirty on the Medway, and the bird above 
alluded to was one of these ; one or two other spe- 
cimens are recorded as shot since, in different parts 
of England. Nothing appears to be known about 
its range, farther than that the London dealers 
receive skins of a large swan from the Baltic known 
G 
