( 617 ) 



HARLEQUIN DUCK. 



FULIGULA HISTRIONIC A, BoNAP. 

 PLATE CCXCVII. Vol. III. p. 612. 



Male from Dr T. M. Brewer. Width of mouth 9 twelfths ; its roof 

 deeply concave as in most other Ducks ; the posterior aperture of the 

 nares oblongo-linear, 8 twelfths in length, margined with very slen- 

 der acute papillae ; the lamellae on each side of the upper mandible 

 about 35 ; those on the edge of the lower mandible about 60 ; the 

 tongue 1 inch 4 twelfths long, fleshy, broad, thick at the base, becom- 

 ing thin toward the end, with thin, fringed margins, and a semicircu- 

 lar tip. CEsophagus 7 inches 2 twelfths long, of the uniform width of 

 8 twelfths on the neck, the proventriculus 9 twelfths in breadth. Sto- 

 mach a strong muscular gizzard, IJ inch long, 1 inch 7 twelfths broad ; 

 the lateral muscles very large, the tendons covering almost its whole 

 surface ; the epithelium very thick, dense, with two opposite elliptical 

 flat grinding surfaces. The proventricular glands form a belt 1 i inch 

 in breadth. The liver is very large, its lobes very unequal, the right 

 2 inches 8 twelfths long, the left 1 inch 8 twelfths. Intestine 58^ in- 

 ches long, its average width 5 twelfths. 



The trachea, which is 6^ inches in length, has at first a breadth of 

 only 3 twelfths, but at the distance of three-quarters of an inch enlar- 

 ges to 4i twelfths, and so continues for 2 inches ; it then contracts 

 to 2\ twelfths, and again at the lower part enlarges to 5| twelfths, and 

 terminates in a large transverse bony dilatation or tympanum, of which 

 the length is 7^ twelfths, the breadth 1 inch 2 twelfths ; it projects as 

 usual to the left side, where it is of a rounded form. The rings of the 

 trachea are 124, broad, firm, and well ossified. The bronchi are of mo- 

 derate width, of about 25 half rings. The lateral muscles are strong, 

 the sterno-tracheal of considerable size, coming off at the commence- 

 ment of the tympanum, and there are no inferior laryngeal muscles. 



In a female, the intestine is 57 inches long ; its width in the duode- 

 nal part 3 twelfths ; the cceca 4 inches long, 3 twelfths in breadth at 

 the widest part, at the base 1 twelfth, and toward the end 2 twelfths ; 

 their distance from the extremity 3 inches. 



