| OCR Text |
Show 1879.] TRACHEA OF T H E GALLINAE. 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 semielhpsoid 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. un 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 extremity 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 |
