CYGXTTS. 91 



flamingoes ; the one reaching deep water by means 

 of lengthened legs, the other being supported on its 

 surface by its form and ample plumage. 



CYGNUS. Generic characters. Bill equally wide 

 throughout its length, base elevated, sometimes 

 tuberculated, laminas nearly concealed, nostrils 

 medial; wings long, ample; legs placed far 

 back, short, hallux small, not lobed. 



Types. C.ferus, Bewickii, 8$c. 



Note. Gregarious in winter ; size large ; trachea 

 convoluted in the sternum ; cosmopolite. 



