382 Mr. YARRELL on the Trachee 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 Stanleyanus, 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 afforded me of preparing and figuring 
part of the bones, and to whom I 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 Grus. 
The Black Swan of New Holland, the Anas Atrata of Lin-. 
næus 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. dns ee 
In the Black Sat thet mue ed 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- 
maining 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 interesting link between the two, and has not, that I 
am aware, been either described or figured. 
The 
