TJRIA. 
213 
ful oars in their submarine flight ; in all the pen- 
guins the feathers of the wings are very short, scale- 
like and adpressed. From the Divers we are very 
easily led to the Auks by means of the Guillemots, 
forming the 
Genus Uria, Brisson. — Generic characters . — Bill 
of mean length, compressed, pointed; maxilla 
bending to the tip, which is notched ; mandible 
with a gentle ascending angle; nostrils basal, 
lateral, half concealed by feathers ; wings rather 
short, accuminated, first quill longest ; legs 
placed far behind, tarsi short, somewhat com- 
pressed ; feet small, palmated, outer and centre 
toe equal in length, claws falcate, sharp ; hal- 
lux wanting. 
Types. — U. troile, brunnichit, &c. Europe, North- 
eastern Asia, North America. 
Note . — Breed gregariously on precipitous rocks ; 
summer and winter plumage slightly different, 
variation confined to the head and neck ; eggs 
disproportionally large. 
