x10 Dr. Laruam’s Effay on the Trachea or Windpipes of Birds. 
one of the dronchie ; the other arifes from a kind of bony arch, 
with which the ¢rachea ends, and which is a trifle above the level of 
the top of the labyrinth. 
XIV. ANAS ACUTA—The Pinratt Duck. Tab. xiii. Fig. 6. 
A. cauda acuminata elongata fubtus nigra, occipite utrinque linea 
alba, dorfo cinereo undulato. 
Anas acuta, Linn. Sy/t. Nat. i. p. 201.—Ind. Orn, 2. p. 864.—Rait 
Syn. Av. p. 147. A. 5.—Brif: Orn. vi. t. 34. f. 1. 2 
Canard a longue queue, Buf: Oi/- ix. p. 199. t13.—Pl. Enl. 954. 
Pfeilfchwanz, Be/ch. der Berl. Nat. Fr. iv. p. 601. t. 18. f. 5. 
Pintail, Gen. Syn. vi. p. 526.—Br. Zool. ii. No. 282.—Will. Orn 
Pp: 376. t. 73. 
This {pecies meafures twenty-eight inches in length, and is com- 
mon in our markets in the winter feafon. The trachea finifhes in 
a bony arch like the former, from which one of the branches of 
_divarication fprings: attached to the fide of this is a nearly round 
bony bladder, delicate in texture, and about the fize of the end of — 
the thumb; the upper furface of it about even with the top of 
the bony arch, but the bottom greatly below it: from which circum- 
{tance it is, independent of fize, particularly diftinguithed from the 
fame part in the Wigeon, though at firft fight appearing fome- 
what fimilar. It may not be amifs here to obferve, that, in young 
birds, this roundith bladder will fuffer itfelf to be indented by pref- 
fure, but at mature age becomes very brittle, fo as not to be han- 
dled without fome care; from the under and inner part of this, the - 
fecond divifion of the ¢rachea takes rife. The oppofite fide is 
formed not greatly different, but puts on the appearance of an oval 
obliquely placed, in the fame manner as in the oppofite fide of fife 
Gadwal, or next fpecies. 
2 : XV. ANAS 
