HAWK OWL. 553 
base, rounded and notched at the end ; its length 74 twelfths, its breadth 
31 twelfths. The mouth is very wide, measuring 1 inch 1 twelfth 
across. The oesophagus, @ 6c, which is 4? inches in length, is of 
nearly uniform diameter, its greatest breadth being 11 twelfths, and 
at its entrance into the thorax 10 twelfths. Its walls are extremely 
thin ; but its longitudinal and transverse muscular fibres are distinctly 
seen. The proventricular glandules are very large and cylindrical, 
forming a belt, bc, 1 inch 1 twelfth in breadth. The stomach, cd e, 
is of moderate size, roundish, 1 inch 5 twelfths long, 1 inch 13 twelfth 
broad ; its walls very thin, the muscular coat being composed of slender 
fasciculi converging toward two roundish tendinous spaces; the inner 
coat or epithelium very soft and rugous, but partially dissolved by the 
gastric juice. The pylorus has a semilunar margin, but is otherwise 
destitute of valve. The contents of the stomach are tufts of reddish 
hair, resembling that of some hare. The duodenum, e/g, which is 34 
twelfths in diameter, curves backwards and upwards, running across to 
the left side, and returning upon itself opposite the fifth rib; it then 
proceeds to the right side under the liver, receives the biliary ducts, 
passes behind and above the stomach, and forms three folds, terminat- 
ing in the rectum, which is laterally curved, and ends in a globular 
cloaca, 7 k, 10 twelfths in diameter. The entire length of the intestine, 
efghk, is 18 inches, its diameter from 4 twelfths to 14 twelfth. The 
rectum is 2 inches long. The cceca, Fig. 2, a 6, a6, are 21 inches in 
length, for 1 inch and 2 twelfths very narrow, their diameter varying 
from 1 to 2 tweilfths, their greatest diameter 4 twelfths, their extremity 
blunt. 
The aperture of the ear, Fig. 3, although very large, is inferior to 
that of many Owls of similar size. It is of an elliptical form, 5 twelfths 
in its greatest diameter, and 4 twelfths across. 
The trachea is 3 inches long, flattened, its diameter nearly uni- 
form, averaging 2 twelfths; the rings moderately firm, 74 in number. 
The bronchi are long, slender, of about 20 very slender cartilaginous 
half rings. ‘The contractor muscles are moderate, as are the sterno- 
tracheal. There is a single pair of flat inferior laryngeal muscles, going 
to the first and second bronchial rings. 
