1 1 Dr. Lai ii am'* EJjay on the Trachea or Windpipes of Birds. 



one of the bronchia: ; the other arifes from a kind of bony arch, 

 with which the trachea ends, and which is a trifle above the level of 

 the top of the labyrinth. 



XIV. ANAS ACUTA— The Pintail Duck. Tab. xiii. Fig. 6. 



A. cauda acuminata elongata fobtus nigra, occipitc utrinque linea 



alba, dorfo cinereo undulato. - 

 Anas acuta, Linn. Syjl. Nat. i. p. 20T.— bid Om. 2. p. 864. — Rail 



Syn. Av. p. 147. A. $*r-&rif. Om. vi. t. 34. £1.2. 



Canard a longue queue, Buf. Oif. ix. p. 199. t. 13. — PL Enl. 95^. 



Pfeilfchwanz, Bcjch. der Bed. Nat. Fr. iv. p. 601. t. 18. f. 5. 



Pintail, Gen. Syn. vi. p. 526.— Br. ZooL ii. No. zSz.-Wil/. Om. 

 p. 376. t. 73. 



This fpecies 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 fizeof 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- 

 llance it is, independent of fize, particularly diftinguifhed 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 roundifh 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 trachea 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 opfofite fide of the 

 Gadival, or next fpecies. 



2 XV. ANAS 



