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, 



Cygnus immutdbilis, YARRELL, 

 PLATE II. Fie*. 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 oi 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 



