RUDDY DUCK. 331 
strong gizzard, of a roundish form, 1 inch 5 twelfths long, 14 inch 
broad ; its lateral muscles very large, and about 8 twelfths thick; the 
epithelium confined to two round spaces 4 inch in diameter, opposite 
the lateral muscles. The intestine is 5 feet 14 inch long, its diameter 
varying from 5 twelfths to 34 twelfths. The rectum is 2 inches 10 
twelfths long ; the coeca 4 inches 2 twelfths, their greatest diameter 24 
twelfths. 
In another male, the cesophagus is 74 inches long; the stomach 1 
inch 5 twelfths long, 1 inch 6 twelfths broad ; the intestine 5 feet 11 
inches long ; the rectum 2? inches ; the cceca 43 inches, their greatest 
diameter 23 twelfths. 
The trachea is 53 inches long. ‘The thyroid bone is comparatively 
large, forming an expansion 7 twelfths long, 5 twelfths broad. At 
_ its upper part the trachea has a diameter of 3 twelfths, about the 
middle enlarges to 4 twelfths, and so continues nearly to the end, 
when it contracts to 2 twelfths. The last ring is very large, being 
formed of five or six united rings, of which the last two or three are 
split ; but there is no expansion or tympanum as in other ducks. 
The muscles are as in the other species of this family. The bronchi 
are of moderate length, with about 15 half rings. 
