Dr. Latuam’s Effay on the Trachea or Windpipes of Birds. 113 
This fpecies is larger than any of the Duck genus before men- 
tioned, except the Swan and Semipalmated Goofe, and the trachea is 
ftouter in proportion, The globular part is a trifle bigger than in 
the Pintail, but lofes its round fhape in fome meafure at the lower 
portion of it: it is likewife much lefs {mooth on the furface, being 
fomewhat furrowed, and marked with minute wrinkled lines. The 
bony arch is much deeper than in any of the foregoing, is attached 
to the globular part almoft the whole of its length, and in fome 
fpecimens meafures full three-fourths of an inch, The whole of 
this part likewife is {tronger than in any fpecies before defcribéd. 
The labyrinthic or globular part of the érachea indeed varies a little 
in refpect to fize, both in the wild and tame forts, but is in general 
larger in the domefticated ones.. Much controverfy has been held 
concerning the Curved-billed Duck; fome fuppofing it to be a variety 
only of the Mallard, and others wifhing to make it a diftin@ 
{pecies. ‘This bird has not come under our view anatomically, 
having only met with it in menageries, or preferved in colledtions ; 
but it is to be wifhed that a ftrict comparifon may be made in re- 
{peét to the trachea, by means of which I have not a doubt of the 
different opinions being at once fettled. 
XVIII ANAS MOSCHATA—Muscovy Duck. Tad.xiv. Fig.1,2. 
Tab. xvi. Figs 5, ©. 
A. facie nuda papillofa. 
Anas mofchata, Linn. Sy. Nat. i. ps 199 —Ind. Orn. i. p. 846.— 
Raii Syn Av. p. 148.—Frifch. t. 180. 
Le Canard mufqué, Buf. O// ix. p. 162. pl. 9.—P/. Eni. 989. 
Die Turkifche Ente, Schr. der Berl. Nat. Fr. iii. p. 372. t. 7. t. 1. 
Mufcovy Duck, Gea. Syn. vi. p. 476.—Will. Orm p. 381, 352 
The frachea in this bird is ftout, and nearly of equal diameter, but 
Vou. IV. so a trifle 
