96 



CYGNUS OLOR. 



Cyg. — Albus ; rostro aurantiaco, tubercula culmine ad basin podibusque atris. 



MUTE SWAN. 



Cyg. -white ; bill orange, with a knob on the culmen and feet black. 



Length 5 feet 6 inches. 



. i //as olor .• . Gmel. Syst. 1 . 50 1 . 



Anas cygnus mansuetus Linn. Syst. A'a/. 1. 194. 



Ran Sy/i. 133 A. 

 Mute Swan Perm. Arc/. Zoo/. 2. 470. 



Lath. Gen. Sy/t. G. 136. 

 Le Cygne Buff. Ols. 9. 3 PI. 1. 



Supposed to have been introduced into this country from Asia, and is said at present to exist 

 in a wild state in Russia and Siberia ; now found commonly on large rivers and pieces of water, 

 where it is half domesticated and breeds freely, laying six or seven eggs of a dirty white colour, or 

 with a very slight tinge of greenish ; sits about six weeks. The trachea in this species does not 

 enter the sternum, but has the tube of equal thickness for its whole length, being merely slightly 

 contracted above the inferior larynx. 



CYGNUS IMMUTAB1LIS. 



Cyg. — Albus; rostro aurantiaco, tuberculaque culmine ad basin atro ; pedibus flavicantibus. 



POLISH SWAN. 



White swan ; with the bill orange, and a tubercle on the culmen at the base black ; the feet 

 yellowish. 



Similar in size and in every other particular to the preceding, except in the eolouiing of the 

 feet and legs, which are light drab colour. 



The young of this species are white from the eggs, and do not exhibit any of the grey or 

 brown colouring found invariably among the others. 



( 'ygnus immutabilis Yarrell. 



For what we have said concerning this species Ave are altogether indebted to the Karl of Derby 



