SPUll-WINGED GOOSE. 



307 



and the expectation having been realized, the Author was 

 permitted to publish the following description and figures : — 

 The windpipe of the Spur-winged Goose is about sixteen 

 inches long, the tube flattened throughout the greater part 

 of its length, but cylindrical at the bottom. The vignette 

 represents the lower portion of the windpipe from three 

 points of view. The figure to the right shows the tube with 

 its bony enlargement on the left side, being its position in 

 the body of the bird ; the other figures to exhibit the circular 

 and oval apertures pervading different parts of this bony 

 enlargement ; the opposite sides not being exactly alike, either 

 in the number, form, or situation of these apertures in the 

 bone, which in a natural state are closed by delicate trans- 

 parent membrane. The bronchial tubes are divided higher at 

 the back than in front, as shown in the left figure, to allow 

 free passage for the oesophagus between them from behind 

 forwards. 



