OCR Text |
Show 360 PROF. A. H GARROD ON THE [Api'- L intervals on the posterior aspect of the intrathoracic portion of the windpipe [as in so many of the birds under consideration, and dependent, no doubt, upon the proximity of the oesophagus] ; but anteriorly the lowermost twelve rings are thinned in such away that the intervals are uniform and deeper than the rings forming them, at the same time that their breadth is half the circumference of the tube itself, they continuing across the middle line, except in the case of the lowermost three, which are divided up by median junc- Fig- 7. Fig. 8. Front view. Lophortyx californicus. Back view. tions of the rings, narrow and not fused between the antepenultimate and the one above it, broad and blended in the two below it. There is a narrow medio-anterior vertical fibrous bond between all the upper thinned rings, taking the place of the lower cartilaginous isthmuses. Posteriorly the penultimate and antepenultimate rings blend in the middle line, the pessulus joining the former in the usual manner. -The last ring is typical and incomplete behind. Ihe first bronchial semiring is large and concave upwards. |