i Dr. Latrnam’s Effay on the Trachee or Windpipes of Birds. 127 
fafcia ; o. the mufcle (one on each fide), which affifts in 
refpiration and in ftraiteming the srachea. 
Tas. XII. 
Fig- 1. The fternum or breaft-bone of the Wild Swan, with the 
2. 
2 
>» 
4. 
Fig. I. 
2. 
trachea in its proper fituation.—The outer part of one 
fide of the keel is taken off, in order the better to expofe’ 
the internal contents to view. 
The fternum with the keel feen in front, ferving to fhew 
the opening into which the ¢rachea enters and returns. 
A fimilar view of the fame parts in the Tame Swan. 
A view of the fternum of the Crane, with the frachea in fitu,. 
—part of the keel taken away as in fig. 1. 
Tas. XIII. 
. The trachea of the Teal, the whole of its length. 
. The trachea of the Garganey. 
. An oppofite view of the fame :—a.a, two mufcles, placed one _ 
on each fide the labyrinth, very confpicuous while recent. 
. The trachea of the Shoveler. 
. The fame feen in an oppofite direction. 
. The lower part of the trachea of the Pintai/. 
. Ditto of the Gadwal. 
. The laft fhown on the oppofite fide.. 
. The trachea of the Wigeon,. 
. Ditto of the Mallard. 
Tas. XIV. : 
The ¢rachea of the young Mofcovy Duck. (See that of the 
old one in Tas. XVI. f. 5,6.) 
The fame feen. on the other fide. 
Fig.. 3. 
