Mr. YARRELL on a new Species of Wild Swan. 453 
ing his imperishable name to so valuable and interesting an 
example among his own most admired and favourite subjects. 
Ordo. Narmaronrs. Illiger. 
Fam. Anatipm. Leach. 
Genus. Cygnus. Meyer. 
* 
Bewickü. C. rostro semicylindrico atro, basi aurantiacá, cor- 
pore albo, caudá rectricibus 18, pedibus nigris. 
And the better to distinguish the Anas Cygnus (ferus) of 
Linnzus, I venture to propose the following specific character : 
ferus. C.rostro semicylindrico atro, basi lateribusque (his 
ultra nares) flavis, corpore albo, caudá rectri- 
cibus 20, pedibus nigris. 
EXPLANATION OF THE PLATES. 
Tas. AALS. 
Fig. 1. Side view of the sternum and trachea of Bewick's Swan. 
a. The keel; b. sternum; c,c. trachea; d,d. muscles 
of voice; e. bone of divarication ; f. bronchie. 
2. Front view of the same part, the anterior portion of the 
trachea turned aside to show the inner ascending part 
of it, the muscles of voice, and the tendinous fascia by 
which both are supported. 
Tan. XXV. 
Fig.1. Upper surface of the sternum of a young bird. 
E Fig. 2. 
