358 GADWALL DUCK. 
6 twelfths, for 2 inches at the commencement 2 twelkths, towards the 
end 22 twelfths, their extremity rounded. 
ho, 
The trachea, h, is 74 inches long ; its diameter at the upper part 4 
twelfths, gradually diminishing to 34 twelfths; it then enlarges to, 5 
twelfths, and contracts to 34 twelfths at the commencement of ‘thegdi- 
latation of the inferior larynx, which is extremely similar to that of the 
Widgeon, but larger ; there being an enlargement, 2, formed by a num- 
ber of the lower rings united, and to the left side a rounded bony tympa- 
num j; the greatest transverse diameter of this part, from 7 to j, is 1 inch 
1 twelfth. The bronchi, & h, are of moderate size, covered with a dense 
TA Ga ie et es ace 
Vt 
layer of adipose matter. 
