IS/9.] 



TRACHEA OF THE GALLING. 



357 



simple, and all the rings are in contact with those contiguous to 

 them throughout their circumference. The lower margin of the 

 penultimate ring faces slightly outwards on either side, whilst in the 

 middle line in front it fuses with the ring below it, a well-defined 

 semiellipsoid ossification developing in the region, upwards as far 

 as the upper margin of the penultimate ring, and downwards to the 

 median point of bifurcation of the last, ring, from which it extends 

 laterally a short distance. The pessulus is attached as in Pavo. 

 It is ossified, the anterior termination being the ossification just 

 described ; the posterior is a triangular extension into the middle 

 of the posterior surface of the penultimate ring, the apex of which 

 reaches its superior margin. The first bronchial semiring is con- 



Fig. 3. 



Fig. 4. 



Front view. 



Back view. 



Caccabis chukar. 



cave upwards, and in front forms a sharp inturned angular process at 

 the spot where it articulates with the anterior extremity of the second 

 semiring. Posteriorly its articular upward-directed process is more 

 developed — so much so that the contour line of the posterior extre- 

 mity of the last tracheal is continuous with that of the ring under 

 consideration and the next as well. The second bronchial semiring 

 differs but little from those which follow it, except in that it articulates 

 with the one above. Its extremities are somewhat more expanded, and 

 articulate freely with the angles of the first ring. Anteriorly it sends 

 inwards a pointed angular process, which advances further towards 

 the middle line than does the similar angle of the semiring above, 

 with which it closely articulates. The semirings which follow have 



