80 



CORVID.E. 



muscles, a third slender and cord-like muscle arises, which 

 goes off to be inserted upon the sternum, as in those birds 

 having one pair ; these are marked d. The fourth muscle, 

 marked h, is the shortest of the five. It arises near the 

 centre of the bottom of the tube, and its fibres, directed 

 obliquely backwards and downwards, are inserted upon 

 the extremity of the first half-circular bone. The fifth 

 muscle, marked g, arises also from the centre of the tube, 

 similar to the last, but is something longer and thicker, 

 having the appearance of being made up of several small 



