382 Mr. Yarrell on the Trachea of Birds. 



but in a male and female of the same age, the greater depth of 

 insertion may occur in the male, as stated in Dr. Latham's 

 paper. The furcula and bronchia also of the Common Crane 

 exactly resemble those of the Demoiselle and Stanley Crane, as 

 might be expected in birds so nearly allied. Before quitting 

 the subject of the Anthropoides Stanleyanns, it is necessary I 

 should state, that this very rare bird passed when dead into 

 the possession of Mr. Leadbeater, to whose liberality I am in- 

 debted for the opportunity aftbrded me of preparing and figuring 

 part of the bones, and to whom 1 with pleasure acknowledge 

 my obligations for many other interesting objects of investi- 

 gation. The Indian Crane, Ardea Antigone of Linneus, has the 

 same form of trachea and sternum as the Common Crane of 

 Europe, Ardea Gri/s. 



The Black Swan of New Holland, the Anas Afrata of Lin- 

 nœus and others, gives me an opportunity of showing a structure 

 intermediate between the two most admired species of the genus 

 Cygnus of Cuvier, the common mute Swan, the stately orna- 

 ment of our lakes and rivers, and our more scarce winter visitor 

 the Hooper. 



In the Black Swan the trachea quits the neck at the bottom, 

 and descends to the centre circular portion of the furcula, to 

 which bone it is firmly bound by a tough membrane ; the re- 

 mainino- portion then rises over the front of the breast bone 

 between the clavicles, and passes backward to the lungs, the 

 last portion of the tube immediately preceding the bone of 

 divarication being flattened horizontally. The form of the tra- 

 chea in our common Swan, in which it follows the neck without 

 deviation, being remembered, and Dr. Latham's figure of the 

 wild Swan referred to, it will be observed, that the Black Swan 

 exhibits an intei'esting link between the two, and has not, that I 

 am aware, been either described or figured. 



The 



