Dr. Latham\t EJfay on the Trachea or Windpipes of Birds. 109 



pear as divided into two unequal portions; on the oppofite part, or 

 that fituated next the breaft, it is flattened, and from the upper part 

 of it the two bronchia have their origin. 



I have fome reafon for affirming, that authors have unneceflarily 

 divided the Teals into more fpecies than really exift ; for the Teal To 

 called, and the Summer Teal, certainly constitute but one; and al- 

 though males have been met with of the latter, it is probable that 

 the external diftinction of feather may not be fixed till the fecond 

 year, or even beyond that period : it is not enough that the tejles 

 are vifibie ; for, as above mentioned, that ciircumftance of itfelf can 

 only prove thefex: it is to the labyrinth alone that we mud have 

 recourfe in all birds which pofTefs it ; for this remains nearly the 

 fame during life. I fcarcely need here obferve, that the male alone 

 poflefTes the labyrinth, not only in this, but alfo in every other 

 fpecies of Duck hitherto examined. 



XIIL ANAS CLYPEATA— -The Shoveler. Tab. xiii. Fig. 4. 5* 



A. roflri extremo dilatato rotundato, ungue incurvo. 

 Anas clypeata, Linn. Syjl. Nat. i. p. 200. — TnJ. Orn. ii. p. 856. — 

 RaiiSyn. p. 144. A. 9. et 13. — Brif. Orn. vi. p. 329. t. 32. f. I. 

 Le Souchet, Buf. Olf. ix. p. 191.— PL Enf. 971. 972. 

 Die Loffelente, Schr. der Bed. Nat. Fr. iii. p. 373. t. 7. f. 2. 

 Shoveler, Gen. Syn. vi. p. 509. — Br. Zool. ii. No. 280. 



This bird is about two inches longer than the laft, and is far 

 from being uncommon. The end of the trachea is furnifhed with a 

 labyrinth, which is fmall in proportion to the fize of the bird, 

 being fcarcely more than half the fize of that of the Garganey. It 

 is of nearly equal dimenfions throughout, except near the bottom, 

 where it iligh try enlarges ; on the left fide is a kind of bony blad- 

 der a little irregular in fhape, about the fize of a large rounceval pea, 

 with two or three flight indentations on the fides j— from this fprings 



one 



