278 SLENDER-BILLED GUILLEMOT. 



with five prominent lines. Tongue If inches long, slender, tapering, 

 trigonal, horny beneath, papillate at the base, and channelled towards the 

 extremity, the tip pointed and thin-edged. (Esophagus 6^ inches long, 9 

 twelfths in width along the neck, within the thorax dilated into an enormous 

 sac, 2 inches in length, li in breadth. The stomach is rather large, 1|- 

 inches long, li broad; the epithelium dense, tough, light red, with strong 

 longitudinal rugae. The proventricular glands form a belt li inches in 

 width, extending over the wider part of the sac. The left lobe of the liver 

 is 2\ inches long, the right lobe 3 inches; the gall-bladder 9 twelfths long, 

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

 inch 4 twelfths long, 3^ twelfths in their greatest breadth, 2\ 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. 



SLENDER-BILLED GUILLEMOT. 



Uria Townsendii, tflud. 



PLATE CCCCLXXV.— Adult and Young. 



I have received not less than four specimens of this small Guillemot from 

 Mr. Townsend, who procured them on the north-west coast of America, 

 not very far from the mouth of the Columbia river. The changes of colour 

 in birds of this genus are well known to be considerable; and I have 

 represented two individuals, supposing one to be an adult, and the other a 

 young bird in its first plumage. 



Slender-billed Guillemot, Uria Townsendi, Aud. Orn. Biog., vol. v. p. 251. 



Adult, 10; wing 5 T V Young, in autumn, 9f; wing 5 T \. 



