3G0 



PROF. A. H GARROD ON THE 



[Apr. 1, 



intervals on the posterior aspect of the intrathoracic portion of the 

 windpipe [as in so many of the birds under consideration, and de- 

 pendent, 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 antepenulti- 

 mate 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. 

 The first bronchial semiring is large and concave upwards. 



