344 AMERICAN WIDGEON. 
cesophagus are contained slender leaves of grasses ; in the gizzard some 
of these leaves and other vegetable matters, small seeds, and a great 
quantity of sand. The cuticular lining or epithelium is dense, slightly 
rugous, much thickened on the spaces opposite the middle of the la- 
teral muscles. The duodenum, g / 7, is 54 inches in its first curve, g A, 
and is then reflected for 7 inches, passes backwards under the kidneys 
and forms several convolutions. The intestine, gh ijk J, is 6 feet 2 
inches long, 3 inch in diameter in its duodenal portion, gradually con- 
tracts to 4 twelfths at the distance of 18 inches from the pylorus, again 
enlarges to 5 twelfths, and near the rectum to 7 twelfths. The rec- 
tum is 43 inches long; the cceca 9 inches, their diameter for nearly 2 
inches being 2 twelfths, after which they are enlarged, their greatest 
diameter being 4 twelfths. The liver is large, the right lobe being 33 
inches long, the left 24. 
The trachea, m, is 74 inches long, of moderate diameter, the rings 
roundish and ossified, about 140 in number, its breadth at the top 44 
twelfths, gradually diminishing to 3 twelfths. At the lower part seve- 
ral of the rings are united so as to form an irregular dilatation, bulg- 
ing out into a rounded sac, m, on the left side, its greatest diameter 
being 10 twelfths. The bronchi are of moderate length, wide, with 
about 25 half rings. The contractor muscles are rather strong; and 
besides the sterno-tracheals, 0, p, there is a pair of cleido-tracheals. 
In a female, the gizzard is 2 inches in its greatest diameter ; the 
intestine is 5 feet 2 inches long. The contents of the cesophagus and 
stomach as in the male. 
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