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RAZOR-BILLED AUK. 

 Alca Torda, Linn. 



PLATE CCXIV. Vol. III. p. 112. 



On the palate are several series of reversed papillae, and two longi- 

 tudinal papillate ridges ; on its anterior part are five prominent lines ; 

 the posterior aperture of the nares linear, 1 inch in length ; width of 

 mouth 11 twelfths. Tongue li inch long, fleshy, slender in its whole 

 length, trigonal, flat above, with a median groove, and tapering to a 

 very thin horny point. CEsophagus 8^ inches long, its width along the 

 neck 10 twelfths, but within the thorax it forms an enormous sac 3^ 

 inches long, 1 inch 11 twelfths in breadth ; the pro ventricular glands 

 very numerous, forming a complete belt 3|^ inches in length, and occu- 

 pying almost the whole of the sac above mentioned. Stomach very 

 small, 10 twelfths long, 9 twelfths in breadth ; its muscular coat thin, 

 the tendons round, and about 5 twelfths in breadth ; the epithelium 

 thin, dense, and longitudinally rugous. Intestine 53 inches long, its 

 average width 5 twelfths ; the cceca 9 twelfths long, 1^ twelfth in 

 breadth, 2 inches 1 twelfth distant from the extremity ; cloaca globular, 

 and about 1 inch in diameter. 



Trachea 5 inches long, from 4| twelfths to 3 twelfths in width, a 

 little flattened ; its rings 95, imossified. Bronchi very wide, of 18 

 half rings. Cleido-tracheal muscles, lateral muscles, sterno-tracheal 

 slips, and a single pair of inferior laryngeal muscles. 



