340 



ANSERES. 



ANATID^. 



AXATID^. 



Cygnus immutabilis, Yarrell.* 

 THE POLISH SWAN. 



Cygnus immutahilis. 



Some of the Lonclou dealers in birds more than forty 

 years ago appear to have been in the babit of distinguishing 

 a large Swan, which they said they received from the Baltic, 

 by the name of the Polish Swan. The Author had reason 

 to believe that this Swan would prove to be a distinct 

 species, though even more nearly allied externally to our 

 Mute Swan, than the Bewick's Swan is to the Whooper. 

 In the spring of 1836 the Ornithological Society of London 

 purchased of the late Mr. Castang, the dealer in birds, a 

 pair of these Polish Swans, with one cygnet of their own 



* Pr. Zool. Soc. 1838, p. 19. 



