neck : they influence the length of the trachese, as well as 

 that of the bronchise, and on account of their place of 

 insertion have been named sterno-tracheal. This pair of 

 muscles sometimes send off a small slip towards the bottom, 

 which is inserted upon the inner surface of the bone called 

 the merry-thought, or forked bone, and have been named in 

 consequence furculo-tracheal ; but this division does not 

 appear to afford any additional powers of voice. In figures 

 1 and 2, letters a a refer to the tube ; b b to the point of 

 division, or bone of divarication ; c to the bronchia, and d 

 to the elongated muscles going off to be attached to the 

 sternum. Another example of two pair of muscles at the 

 inferior larynx is found in the family of the Pigeons, as re- 

 presented in the third figure of this third group. The 

 second pair in this instance, marked 0, are formed of a por- 

 tion of the sterno-tracheal muscles, but taking a different 

 direction. They proceed by a narrow slip, from that point 

 upon the tube where the first pair of muscles go off to be 

 inserted upon the sternum down the side of the trachea, to 

 be attached externally to the membrane between the lowest 



