Dr. Latham'j EJfay on the Trachea or Windpipes of Birds. 127 



fafcia ; 0. the mufcle (one on each fide), which aflifts in 

 refpiration and in ftraitening the trachea. 



Tab. XII. 

 Eg. -I. The flernum or breaft-bone of the Wild Swan, with the 

 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. 



2. The fternum with the keel feen in front, ferving to fhew 



the opening into which the trachea enters and returns. 



3. A fimilar view of the fame parts in the Tame Swan. 



4. A view of the fternum of the Crane, with the trachea in fitu, 



— part of the keel taken away as in fig. 1. 



Tab. XIII. 



Fig. I. The trachea of the Teal, the whole of its length, 



2. The trachea of the Garganey. 



3. An oppofite view of the fame : — a a. two mufcles, placed one 



on each fide the labyrinth, very confpicuous while recent. - 



4. The trachea of the Shoveler. 



5. The fame feen in an oppofite direction. 



6. The lower part of the trachea of the Pintail. 



7. Ditto of the Gadwal. 



8. Thelaft fhown on the oppofite fide. 



9. The trachea of the Wigeon. 

 10. Ditto of the Mallard. 



Tab. XIV. 



Fig. I. The trachea of the young Mofcovy Dack, (See that of thc- 

 old one in Tab. XVI. f. 5, 6.) 

 2. The fame feen on the other fide. 



% 3- 



