4 Mr. Yarrell's Description of the Organ of Voice in a new fVild Swan. 



has two convolutions within the sternum, of very opposite character in their 

 directions ; the bronchise also differ materially from both. The representa- 

 tions of the various parts, on comparison with those already published, will 

 render these differences much more apparent than this concise description ; 

 and the examination of them will, I trust, convince ornithologists that the 

 Cygmis Buccinator of Dr. Richardson is a species perfectly distinct from any 

 hitherto made known. 



EXPLANATION OF TAB. I. 



Fig. 1. Side view of the sternum, a section having been made to show the 

 trachea in its natural situation. 



2. The anterior portion of the sternum, seen from above. 



3. The inside of the hollow protuberance. 



4. The protuberance, seen from the right side. 



5. The bronchise, seen from the side. 



6. The bronchise, seen from above. 



7. The bone of divarication, side view. 



8. The same bone, seen from above. 



9. The muscle of voice in its course along the tube of the trachea. 



