122 Dr. Lath am' s EJJay on the Trachea or Windpipes of Birds. 



The Red-breajled Merganfer has an enlargement of the trachea 

 about the middle of its length, imitating that of the Golden Eye, m 

 the fame place, but differing, as before obferved, in being bony inftead 

 of cartilaginous,, and the bony plaits of which it confifts being mod 

 curioufly furrowed or channelled tranfverfely : befides this, the lower 

 part of the trachea ends- in a large and remarkable bony- cavity, of 

 an irregular heart fhape, with two openings on one fide, and one on 

 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 bronchia 

 srife, and from thence lofe themfelves in the lungs, as in other 

 fubjects. 



XXVI. MERGUS MERGANSER— Greater Goosander. 



M. crifta longitudinali ere&iufcula, pectore albido immaculato r . 



rectricibus cinereis fcapo-nigricante. 

 Mergus Merganfer, Linn. Syfr. Nat. i. p. 208.— Ind. Orn. ii. p. 82$ 



Rail Syn. Av. p. 134. A. 1 . — Brif. Orn. vi. p. 23 1 . t. 32. 

 Le Harle, Buf. Of. viii. p. 267. t. 23.— PL Enl. 951. 

 Tauchergans, Befch. der Bed. Nat. Fr. iv. p. 594. t. 18. f. 3.— 



Beckfl. Vog. Deutfch. ii. p. 724, Note *. 

 Merganfer or Goofander, Gen. Syn. vi. p. 418.— Br. Zoo?. No. 260. 



t. 92. f. 1.— mil. Orn. p. 335. t. 64. 



A fufficicnt idea of the trachea of this fpecies may be formed by 

 acompanfon with that of the foregoing. In refpeft to the lar^e 

 bony cafe at the bottom, it is greatly fimilar; but the upper part of 

 the trachea differs in having two enlargements inflead of one- the 

 firft placed about one third from the glottis, or entrance at the top ; 

 the fecond nearly midway between the firft and the bottom. This 



is 



