( 615 ) 



PINTAIL DUCK. 

 Anas acuta, Linn. 



PLATE CCXXVII. Vol. III. p. 214. 



Male. Width of mouth 8 twelfths ; its roof very deeply concave, 

 with a median prominent line, on which are 8 papillae ; the lamellae on 

 the upper mandible 50, and not reaching the mai'gin ; those on the upper 

 edge of the lower mandible about 116. Tongue 2 inches 1 twelfth long, 

 fleshy, prominent at the base, with a narrow median groove, thinner 

 and broadly channelled toward the end, the edge thin and bristled, with 

 6 large papillae toward the base, on each side, the tip somewhat semi- 

 circular, very thin, and horny. (Esophagus 11 inches long, 4 twelfths 

 in width, at the lower part of the neck dilated to 8 twelfths, then con- 

 tracting to 4 twelfths ; the proventriculus 8 twelfths in breadth. The 

 stomach a very muscular oblique gizzard, 1 inch 11 twelfths in breadth, 

 1 inch 4 twelfths long, the right muscle 9 twelfths, the left 11 twelfths 

 thick ; the epithelium with two very thick concave grinding plates. In- 

 testine 4 feet long, its average width 4 twelfths ; coeca 4 inches 9 twelfths 

 long, their greatest width 2 twelfths, narrow at the commencement and 

 toward the end, 3 inches from the extremity. Liver with the right 

 lobe 2 inches 8 twelfths long. The left 2 inches ; gall-bladder 1 inch 

 long, 5i twelfths broad. 



Trachea 8^ inches long, narrow at the commencement, its breadth 

 being 2^ twelfths, gradually enlarging to 4^ twelfths ; then contracting 

 to 3 twelfths, and terminating in a transversely oblong bony dilatation, 

 projecting on the left side, with a rounded bulge similar to that of the 

 Dusky Duck and Teal. The rings are firm, 140, besides about 8 which 

 are blended with the tympanum. Bronchial half rings 22 and 26. Mus- 

 cles as usual. 



