118 Dr. Lara Ams Effay on the Trachea or Windpipes of Birds. 
The Shieldrake is one of the moft beautiful of the Duck genus, 
and the lower part of the érachea in the male is of a fingular con- 
ftruction, being not ftrictly fimilar to any of the foregoing; it is 
pretty long, and nearly of equal dimenfions, except towards the - 
bottom part, where it leflens fomewhat : juft above the divarication 
are two bony kind of roundifh bladders, one larger than the other, 
of unequal furface, and moft delicate texture, being of fo tender a fa- 
bric as {carcely to bear the preflure of the finger, without indenting 
in young fubjeéts, or breaking in older ones; and, when dry, putting © 
on more or lefs of a fhrivelled appearance, though in a recent ftate 
they appear to be nearly tranfparent.. Though fo greatly different 
from the fame part in the Mallard, as before defcribed, yet its voice 
is faid not to be unlike that bird. 
WE now proceed to fome birds, in which not only an enlarge- 
ment at the lower end of the trachea is obfervable, but likewife the 
trachea itfelf is either dilated, or otherwife enlarged, and fometimes 
in more places than one. 
XXIII. ANAS CLANGULA—The GoLpEN Eye Duck. 
Tas, xv. Fig. 1, 2 
A. nigro alboque varia, capite tumido violaceo, finu oris maculaalba. 
Anas Clangula, Linn. Sy/t. Nat, i. p. 201.—Jnd. Orn. ii. ele 
Raii Syn. Av. p. 142. A, 8.—Brif. Orn. vi. p. 416. t 39. f.2 
—Frifch. t. 183, 184. 
Le Garrot, Buf. O/- ix. p. 222.—Pl. Enl. 802. 
Die Quackerente, Be/ch, der Berl. Nat. Fr. iv. p. 599. t. xvii. f. 1, 2. 
Golden Eye, Gen. Syn. vi. p. 535.—Br. Zool. No. 276.—Will, Orn. 
px 368.2, 73. 
In 
