28 



BRENT GOOSE. 



obliquely, and of an elliptical form, its length being 1 inch 9 twelfths, 

 its breadth 2 inches 11 twelfths. This great breadth is caused, as in 

 other birds of this family, by the vast size of the lateral muscles, of 

 which the left, d, has a thickness at the middle of 1 inch 4^ twelfths, 

 the right, e^ of 1 inch 3 twelfths, this leaving but a very small space 

 between the two grinding surfaces, which are placed obliquely. The 

 lower muscle,/, is narrow and of moderate thickness. The epithelium 

 is soft unless on the two grinding plates, which are of an elliptical 

 form, a little concave, smooth in the middle, longitudinally grooved to- 

 ward the margins. The proventricular belt of glandules is 1 inch 3 



Fig. 2. 



