264 HORNED-BILLED GUILLEMOT. 



white which is the general colour of the lower parts, with the exception of 

 the flanks, which are black. All the upper parts also are greyish-black. 



Length to end of tail 10^ inches; bill along the ridge -yf, along the edge 

 of lower mandible 1^; wing from flexure 5 T 9 2-; tail 1^; tarsus 14; middle 

 toe ljj, its claw T 4 j. 



Young fully fledged. 



The young bird has the bill black, the feet dusky, the upper parts 

 blackish-grey, each feather black in the centre, the lower greyish-yellow, 

 transversely barred with dusky, the tail broadly tipped with white. 



HORNED-BILLED GUILLEMOT. 



Uria occidentalis, Bonap. 



PLATE CCCCLXXI.— Adult. 



This species is from the north-west coast of America, the figure was taken 

 from a specimen lent to me for that purpose by the Prince of Musignano. 



Cerorhyncha occidentalis, Bonap. Syn., p. 428. 



Western cerorhyncha, Kutt. Man., vol. ii. p. 538. 



Horned-billed Guillemot, Ceraiorhyncha occidentalis, Aud. Orn. Biog., vol. v. p. 104. 



Adult, 151, wing, 6j§. 



North-west coast of America. 



Bill shorter than the head, stout, straightish, broad at the base, the mouth 

 measuring seven-eighths of an inch across, compressed toward the end; 

 upper mandible with an oblong compressed knob on the ridge between the 

 nostrils, beyond which the dorsal line is declinate and decurved toward the 

 end, the sides sloping, the edges sharp, the tip narrow, obtuse, with a 

 distinct notch immediately behind it; the gap-line slightly arched; lower 

 mandible with the angle long and rather wide, the dorsal outline ascending 

 and straight, the sides sloping outwards and flattened, the edges thin and 

 direct, the tip acute. Nostrils linear, near the margin, pervious. 

 \ Body full and compact; neck short and thick; head large, ovato-oblong. 

 Feet short, stout, placed far behind; tibia bare for a short space; tarsus very 



