1879.] 



TRACHEA OF THE GALLING. 



365 



last two tracheal rings and the first two bronchial semirings peculiar 

 to them. Their direct front view always exhibits the posterior ar- 

 ticulation of the first bronchial semiring with the ring above and the 

 semiring below, as in no other Gallinaceous bird with which. I am 

 acquainted ; thus r it includes the whole of the considerable inter- 

 annular intervals between them, the upper ovoid, the lower semi- 

 ovoid, with its convexity downwards. In Phasianus there is no 

 interval between the penultimate and last tracheal rings, nor any of 

 importance higher up. In P. colchieus, however, above the ante- 



Fig. 13. 



Fie. 14. 



Front view. 



Phasianus colchieus. 



Back view. 



penultimate ring, there are small median intervals, fusiform and elon- 

 gate in front, minute behind. These shortly become the notches of 

 the interlocking superior rings. 



Pucrasia darwini is so like the genus Phasianus, as far as the 

 parts under consideration are concerned, that it needs no separate 

 description. Any difference is in the direction of Euplocamus, the 

 sides of the last tracheal ring being slightly uptilted. 



Returning to Euplocamus, a start in another direction brings us 

 to Thaumalea, T. picta and T. amherstice being identical, as far as 

 their windpipes are concerned. In this genus the intrathoracic 

 rings (tracheal rings) are in contact all round, as far as and including 

 the penultimate ring, which sends down a short median anterior pro- 

 cess to articulate with a small corresponding upward-directed one 

 from the upper margin of the last ring. Posteriorly, in the young 

 bird, the blunted triangular extremity of the pessulus interpolates 

 itself between the two slightly expanded ends of this (there- 

 fore imperfect) ring, its extremity meeting and even disrupting 



