72 



CORVID^.. 



The inferior larynx, the true situation of the organ of 

 voice in birds, as the experiments of Baron Cuvier have suf- 

 ficiently proved, is situated at the bottom of the tube, and is 

 formed sometimes by the approximation of several of the 

 lower rings of the trachea more or less firmly ossified toge- 

 ther, and occasionally of solid bones ; varying in form, being 

 compressed, conical, or triangular at its lower surface, figs. 

 4 and 5, a and 6, of the second group, having a central cross- 

 bone, figs. 4 and 5, a, a, extending from behind to the front, 



