122 Dr. Latrmam’s Effay on the Trachee or Windpipes of Birds. 
The Red-breafled Merganfr has an enlargement of the trachea 
about the middle ofits length, imitating that of the Golden Eye, in 
the fame place, but differing, as before obferved, in being bony inftead 
of cartilaginous, and the bony plaits of which it confifts being moft ' 
curioufly furrowed or channelled tranfverfely : befides this, the lower 
part of the frachea ends in a large and remarkable bony cavity, of 
an irregular heart fhape, with two openings on one fide, and oneon 
the other; all of which are covered with fine membranes, in the 
fame manner as before obferved in the Scaup, Gadwal, and Tufted 
Ducks; from the bottom of this triangular bony box the two bronchie 
erife, and from thence lofe themfelves in the lungs, as in other 
fubjects. 
XXVI. MERGUS MERGANSER—GrEATER GOOSANDER- 
M. crifta longitudinali erectiufcula, pectore albido immaculato, 
reCtricibus cinereis fcapo- nigricante. 
Mergus Merganfer, Linn. Syf. Nat. 1. p. 208.—Ind. Orn. ii. FA 828. 
Rati Syn. Av. p. 134. A. 1.—Brif Orn. vi. p. 231. t. 32. 
Le Harle, Buf. O/f vil. p. 267. t. 23.—P/. Enl. gst. 
Tauchergans, Be/ch. der Berl. Nat. Fr. iv. p. 594. t. 18. f. 3.— 
Beckf, Vog. Deut[ch. i. p. 724, Note * 
Merganfer or Ae cchandek Gen. Syn. vi. p. hee. —Br. Zool. No. 260. 
t. 92. f. 1.—Will. Orn. p. 335. t. 64. 
A fufficient idea of the trachea of this fpecies may be formed by 
a comparifon with that of the foregoing. In refpeét to the large 
bony cafe at the bottom, itis greatly fimilar; but the upper part of 
the ¢rachea differs in having two enlargements inftead of one: ‘the . 
firft placed about one third from the g/oftis, or entrance at the top ; 
the fecond nearly midway between the firft and the bottom. This 
is 
4 
