LITTLE GUILLEMOT. 
145 
length, one inch and an eighth in its greatest breadth. It is remarkably 
large for the size of the bird, and of a dull uniform pale greenish-blue. 
Genus Y.— URIA, Lath. GUILLEMOT. 
Bill generally shorter than the head, stout, compressed, tapering, acute ; 
upper mandible with the dorsal line slightly arched ; the ridge narrow, 
broader at the base, the sides sloping, the edges sharp and inflected, the tip 
a little deeurved, with a slight notch ; nasal groove broad, feathered ; nos- 
trils at its lower edge, sub-basal, lateral, longitudinal, linear ; lower man- 
dible with the angle rather long, narrow, the dorsal line ascending and 
straight, the back very narrow, the sides nearly flat, the edges sharp .and 
inflected, the tip acute. Head large, oblong ; neck short and thick ; body 
stout, elongated, rather depressed. Feet short, placed far behind ; the 
greater part of the tibia concealed, its lower part bare'; tarsus short, stout, 
compressed, anteriorly scutellate ; toes three, of moderate length, middle 
toe longest, outer little shorter, scutellate, connected by entire webs. Claws 
small, slightly arched, compressed, rather acute. Plumage dense, very soft, 
blended. Wings rather short, narrow, acute ; primary quills curved, taper- 
ing, the first and second longest ; secondaries short, rounded. Tail very 
short, rounded, of twelve or more feathers. 
Yol. Yin.— 19 
