ZOOLOGY. 117 



or in the clefts of rocks ; the eggs and young are 

 occasionally eaten. One species, (A. Impermis) the Great 

 Avvk, is almost destitute of wings, and is unable to fly ; four 

 species frequent our shores. British Ornithology^ vol. 1, 2. 



6. Uria^ Guillemot. Bill slender, very sharp-pointed, 



edges cultrated ; the upper mandible slightly curving 

 towards the tip ; base of the bill covered with short 

 downy feathers ; nostrils linear, placed in a furrow near 

 the base ; tongue slender, almost the length of the bill; 

 Jeet three toed, palmated. 



This genus agrees in most particulars with the preceding, 

 ^Qj lay but one egg, in similar situations with the Awks. 



7. Colymbus. Diver. Bill strong, strait, pointed, edges of 



both mandibles inclined inwards, the upper mandible 

 somewhat projecting; nostrils linear; tongue long,, 

 pointed, serrated on the sides near the root ; legs thin, 

 compressed sideways ; toes four, the outer one longest, 

 palmated ; the hind toe connected to the inner one by 

 a small membrane ; tail short, composed of twenty or 

 more feathers. 



The Divers are generally confined to the Arctic circle, ex- 

 cept during extreme frosts, whenthey frequent the northern- 

 most shores of Europe and America ; they feed on fish and 

 other marine productions ; five species have been met with 

 in the British Islands. 



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