American Wild Swan. 89 
in seven oblong folds and had two ceca, which were often of differ- 
ent lengths. 
I have not discovered any variety either in external appearance, 
or internal peculiarity to depend upon sex. 
Mr. Yarrell gives the following, as the specific characters of both 
the English wild Swans. 
C. ferus. Beak black and semi-cylindrical—vase and sides even 
beyond the nostrils yellow—body white—tail with twenty feathers— 
feet black. 
C. Bewickit. Beak black and semi-cylindrical—base orange— 
body white—tail eighteen feathers—feet black. 
The following is the specific character of the American Swan. 
C. Americanus. Beak black and semi-cylindrical—sides of the 
base, with a small orange or yellow spot—body white—tail twenty 
feathers—feet black. . 
Note.—After the above had been written, I received a communi- 
cation from Mr. Yarrell, London, containing a proof sheet of Dr. 
-Richardson’s “ Northern Zoology,” a work not yet published. It 
contains the following description of an American Swan which he 
met with in his expedition with Franklin, and which he considers the 
regular Trumpeter Swan. It is decidedly different from the Ameri- 
canus in the entire absence of colored mark on the bill, and in the num- 
ber of tail feathers. It is probably the species mentioned by Lewis 
and Clark. 
Cyenus buccinator (Richardson) Trumpeter Swan. 
Color white—Head glossed above with chesnut—Bull, cere, and 
legs entirely black.—Tail twenty four feathers. The fold of the wind- 
pipe enters a protuberance on the interior aspect of the sternum at its 
upper part which is wanting in the C. ferus and Bewicku ; in other 
respects the wind-pipe is distributed through the sternum nearly as 
in the latter of these species. 
EXPLANATION OF PLATES. 
The specimens from which the figures were drawn, resemble so 
much those pictured by Mr. Yarrell, and the delineation of that writer 
being so admirably adapted to display the structure, that his positions 
and general outlining have been chosen by the engraver, the detail be- 
ing changed to suit the peculiarities of my specimens. - 
Plate I.—Fig 1. Internal surface of the breast-bone of an adult 
Swan, the cavity in the sternum extending to the posterior extremity 
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