OCR Text |
Show 364 PROF. A. H. GARROD ON THE [Apr. I, first semiring with the last tracheal at its (should be) articulating spot. The pessulus is broad ; and the angle on each side of its posterior blending with the penultimate ring runs a short way into tbe latter so as to reduce its depth a little at the spot. The interannular intervals are the same as in E. swinhoii, except the one between tbe antepenultimate and penultimate rings, which is interrupted in front by the narrow cartilaginous isthmus between them. Above this the following twelve rings or so touch all round; and they are succeeded by typically interlocking rings in the cervical portion of the tube. It must be also mentioned that whilst the plane of the penultimate tracheal ring is transverse, that of each lateral moiety of the Fig. 11. Fig. 12. Front view. Back view. Euplocamus albocristatus. last one, as well as the first bronchial semiring, runs upwards from its more fixed median anterior and posterior parts. The plane of the second semiring makes an angle of some 15° with the first. In this last respect, as well as others, the genus Phasianus differs from Euplocamus. In Phasianus wallichii, P. colchicus, and P. versicolor the plane of each tracheal ring, as well as that of the uppermost bronchial, semirings, is nearly, if not perfectly, transverse. The whole trachea narrows slightly at its lower end, to expand again opposite the last two or three rings. As in Euplocamus, the last three rings fuse in the middle line behind, as do the last two (in P. wallichii the last three) in front, whilst in adult birds the anterior extremities of the first and second semirings participate in the blending, as does the pessulus posteriorly. In P. colchicus and P. versicolor (which differ from P. wallichii about as much as Euplocamus swinhoii does from its allies) there is a robustness about the |