AtTKS. 227 



In succession to this form, we would place what 

 may be termed the True Auks, expert sea birds, 

 penguin-like in form, the wings proportionally 

 shorter and less developed than in the preceding 

 birds, but they breed in the same manner, and have 

 the same seasonal changes with them. 



GENUS ALCA. Linnceus. Generic characters. 

 Bill short, deep, compressed, cultrated, surface 

 transversely sulcated; tip of the maxilla arched, 

 hooked; nostrils linear, lateral, placed near 

 the gape, (head narrow in front, prolonged) ; 

 wings short, narrow, first quill longest; legs 

 placed behind, tibia within the integuments; 

 tarsi short ; feet small, hallux wanting. 



Types. A. impennis, tor da. Northern Europe 

 and America. 



Note. Principally gregarious ; breed on ledges of 

 rocks ; flight imperfect. 



