Family Lamettirottm. 

 Genus Cyyntu (Swans). 

 1241 The skeleton of the Wild Swan (% /*). 



Then an 28 Tertebne between the skull and the Mcram, the Ust fire of which tupport 

 tovesible ribs : of these the first pair is Ore ; the next four are articulated to the sternum by 

 bony hsnnapophyses ; the hut fire pair* of rib* are attached to the sacrum and also to the 

 sternum ; but the tenth, or last rib on the left side, is very rudimentary, being only about 

 one inch in length. There are 7 caudal vertebne. The trachea penetrates the sternum, the 

 apex of the furculum bending upwards and forming a hoop orer it as it enters into the keel 



ofthebooe. 



Mu*. lirooke* 



1242. The skeleton of the Wild Swan (Cyyitiu fertu). 



The vertebral formula is the same as in the preceding specimen. 



Mtu. South. 



1243. The skull of the Wild Swan (Cyyiiu fenu). U**teria*. 



1244. The skull of the Wild Swan (Cypuu fenu), longitudinally bisected. 



J/unferia*. 



1245. The skull of the Wild Swan (Cyyttu fertu). PurcAtufd. 



1246. The skeleton of the tnmk of a Wild Swan (Cygniu fenu). A portion of the 

 right side of the sternum has been removed to exhibit the tortuous trachea 

 which it incloses. 



To the great length and peculiar course of the windpipe in thin species is to be attributed 

 lU remarkably loud and harsh voice, whence the name Hoofer, or Whittling Swan, has been 

 derived ; and is applied in contradistinction to the domestic or Mule Strait, in which, as in 

 most other birds, the trachea proceeds at once to the lungs, without entering the sternum. 



In the female of the wild species, the course of the trachea is much more limited than in 

 the male, seldom penetrating the sternum to a greater extent than from three to four inches. 



Htmtfrian. 



1247. The sternum and scapular arch of a Wild Swan (Cygntu fmu). 



Mu. Jirooket. 

 2 a 



