SLENDER-BILLED GUILLEMOT. 
161 
cave, with five prominent lines. Tongue 13 inches long, slender, tapering, 
trigonal, horny beneath, papillate at the base, and channelled towards the 
extremity, the tip pointed and thin-edged. (Esophagus 63 inches long, 9 
twelfths in widtK along the neck, within the thorax dilated into an enor- 
mous sac, 2 inches in length, 1J in breadth. The stomach is rather large, 
13 inches long, 1^ broad ; the epithelium dense, tough, light red, with strong- 
longitudinal rugae. The proventricular glands form a belt 13 inches in 
width, extending over the wider part of the sac. The left lobe of the liver 
is 23 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, 33 twelfths in their greatest breadth, 23 inches distant 
from the extremity ; the cloaca ovate, 10 twelfths long. Trachea 4 inches 
4 twelfths long, from 4 twelfths to 23 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. 
SLENDEK-BILLED GUILLEMOT. 
Uria Townsendii, Aud . 
PLATE CCCCLXXY. — 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 repre- 
sented 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 tV Young, in autumn, 93 ; wing 5 T V» 
Vol. VIII.— 21 
