BLACK GUILLEMOT. 627 



rage with 8 twelfths. The cceca, Fig. 2, cc, 2\ inches long, 4i twelfths 

 broad, towards the end 6 twelfths, with the extremity rounded. The 

 rectum is 2 inches long, with a globular cloaca, 6, 1| inch in diameter. 

 Trachea 11| inches long, much flattened, from 6 twelfths to 4 

 twelfths in breadth ; the rings 145, with 2 dimidiate. Bronchi mode- 

 rate, of 20 half rings. Lateral muscles strong ; a single series of in- 

 ferior laryngeal muscles going to the last half ring of the trachea. 



BLACK GUILLEMOT. 



Uria Grylle, Lath. 



PLATE CCXIX. Vol. HI. p. 148. 



Male from Dr T. M. Brewer. The palate is flat, with two pa- 

 pillate ridges, and a series of papillae on each side, parallel to the pos- 

 terior aperture of the nares, which is linear, and 10 twelfths long ; 

 the anterior part concave, with five prominent lines. Tongue If inch 

 long, slender, tapering, trigonal, horny beneath, papillate at the base, 

 and channelled towards the extremity, the tip pointed and thin-edged. 

 QEsophagus 6^ inches long, 9 twelfths in width along the neck, within 

 the thorax dilated into an enormous sac, 2 inches in length, 1^ in 

 breadth. The stomach is rather large, \^ inch long, 1^ broad ; the epi- 

 thelium dense, tough, light red, with strong longitudinal rugae. The 

 proventricular glands form a belt 1^ inch in width, extending over the 

 wider part of the sac. The left lobe of the liver is 21 inches long, the 

 right lobe 3 inches ; the gall-bladder 9 twelfths long, 4i twelfths in 

 breadth. The intestine is 4 twelfths in width ; the coeca 1 inch 4 twelfths 

 long, Z\ twelfths in their greatest breadth, 2 j inches distant from the 

 extremity ; the cloaca ovate, 10 twelfths long. Trachea 4 inches 4 

 twelfths long, from 4 twelfths to 2^ twelfths in breadth ; the rings 115. 

 Bronchial half rings 26. The tracheal rings are feeble, unossified, 

 narrow in the middle and behind, as in the Auks, Gulls, Terns, and 

 generally in all birds of which the rings are unossified. There are 

 cleido-tracheal muscles, lateral muscles, sterno-tracheal, and a single 

 pair of inferior laryngeal. 



