J 



ANSERIN/E.} 



18 





GENUS VT. CYGNUS. 



Ext. Char. Pedes magni, digitis posterioribus parvis, gibbosis. mediis longissimis. Ros- 

 trum magnum, lateribus parallelibus. Nares subovales, in medio rostri posits. Cervia longa. 



Anat. Char. Trachea tubula equali, aliquando in sterno penetrante. Larynx inferutt { 



ossea. Sternum carina antice incurvata. 



Ext. Char. Feet large, Avitb tbe posterior toes small, gibbous, the middle ones longest. 

 Bill large, tbe sides parallel. Nostrils suboval, placed in tbe middle of* tbe bill. Neck long. 



ANAT. Char. Trachea with the tube of equal size, sometimes penetrating the sternum. 

 Inferior Larynx osseous. Sternum with the keel anteriorly curved. 



Cygnus. Ray. Briss. 



Anas. Linn. Lath. 



Type. Cygnus ferns. 



