328 RUDDY DUCK. 



sides of the neck greyish-brown, lower part of neck dull reddish-brown, 

 waved with dusky; upper parts as in the adult, but of a duller tint; lower 

 parts greyish-white. 



Young in December. 



Bill dusky; iris hazel; feet yellowish-green, webs dusky. All the upper 

 parts dull reddish-brown, tinged with grey, and barred with dusky; wings 

 and tail dark greyish-brown. Cheeks, fore part and sides of neck, and all 

 the lower partsj dull yellowish-white, undulated with dusky; as is the rump 

 above; the lower tail-coverts white. 



The tongue of a male is 1 inch S twelfths long, and of the same general 

 form as that of the Fuligulae, but a little more dilated at the end. The oeso- 

 phagus is ^ inch in diameter until its entrance into the thorax, when it con- 

 tracts, and again expands to 6 twelfths, to form the proventriculus, of which 

 the glandules are oblong, small, and very numerous, occupying a space of 2i 

 inches in length. The stomach is a strong gizzard, of a roundish form, 1 

 inch 5 twelfths long, lj inches broad; its lateral muscles very large, and 

 about S twelfths thick; the epithelium confined to two round spaces \ inch 

 in diameter, opposite the lateral muscles. The intestine is 5 feet 1^ inches 

 long, its diameter varying from 5 twelfths to 3^ twelfths. The rectum is 2 

 inches 10 twelfths long; the coeca 4 inches 2 twelfths, their greatest diame- 

 ter 2\ twelfths. 



In another male, the oesophagus is 1\ 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 coeca 41 inches, their greatest diameter 2\ twelfths. 



The trachea is 5f 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. 



