HORNED-BILLED GUILLEMOT. 
147 
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 Q > along the edge 
of lower mandible l r 2 2 ; wing from flexure 5 / 2 ; tail 1 ^- ; tarsus 1 A; middle 
toe 1 , its claw -, 4 2 . 
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, Nutt. Man., vol. ii. p. 538. 
Horned-billed Guillemot, Ceratorhyncha occidentalis, Aud.Orn.Biog., vol. v.p. 104. 
Adult, 154, wing, 6 ff. 
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 
