20() AQUILA CHRYSAETUS. 



before, margined with minute papillae. The tongue is an 

 inch and a quarter in length, concave above, emarginate and 

 papillate at the base, horny beneath, with the tip rounded and 

 slightly emarginate. The oesophagus is thirteen inches long, 

 at the commencement an inch and a half in width, but pre- 

 sently enlarging to form a great sac or crop three inches in 

 width, and four in length ; it then contracts on entering the 

 thorax, and again enlarges to the width of an inch and a half. 

 Its transverse muscular fibres are conspicuous in its whole ex- 

 tent, and on its inner surface open numerous mucous crypts. The 

 stomach is roundish, a little compressed, two inches and a half 

 in diameter, its tendons seven-eighths, its muscular coat thin, 

 and composed of a single series of fasciculi. The proventri- 

 cular glandules, which are cylindrical, form a continuous belt 

 an inch and a half in breadth. The intestine is four feet eight 

 inches in length, at its anterior part seven twelfths in width, 

 toward the rectum only two-twelfths. The coeca are two- 

 twelfths and a half long. The rectum is six inches and a half 

 in length, about nine-twelfths in width, but enlarges into a 

 globular sac two inches in diameter. Plate XX, Fig. 2. 



The nostril, which is broadly elliptical, oblique, with a 

 soft ridge internally from the upper side, is five-twelfths long, 

 and three-twelfths in breadth. The aperture of the eye is 

 eight-twelfths, that of the ear five-twelfths. 



The cere is bare above, but its sides, and a broad space from 

 the bill to the eye, are covered with bristle-feathers, having a 

 few downy filaments at their base ; the supraocular ridge is 

 bare, as are the eyelids, which however are ciliated. On the 

 head the feathers are small, narrow, lanceolate, and acumi- 

 nate ; on the neck similar, but larger and broader ; on the 

 back ovate and acuminate, those before larger ; the scapulars' 

 large and strong ; on the lower parts also ovate, on the tibia 

 and tarsus short and blended, on the outer side of the former 

 elongated. The feathers of the abdomen are loose and downy. 

 The wings, which when closed reach nearly to the end of the 

 tail, are very long and broad ; the primaries ten, the secon- 

 daries seventeen, the humerals six of large size ; the outer 



