372 PROF. A. H. GARROD ON THE [Apr. 1, 



chial semirings blend with it laterally. Laterally, the separation 

 between the last and penultimate rings is feebly indicated, as it is 

 posteriorly by the non-ossification of the latter, notwithstanding the 

 blending of the two. Posteriorly the oblong ossified cartilage, with 

 its unossified and slightly indented upper margin (the part formed 

 by the penultimate ring), is joined by the slender pessulus in the 

 middle of its lower edge, whilst it is with its lower extreme angles 

 that the simple posterior extremities of the first bronchial balf-rings 

 blend, the same parts of the second semirings not participating in 

 the fusion, and being almost if not quite free, as are those below it 

 at both ends. All the upper bronchial semirings are slender, strongly 

 convex upwards, and separated by intervals not greater than their 

 depth. The interval between the last tracheal ring and the first 

 semiring, to which it is united both in front and behind, is fairly 

 deep and crescentic. The antepenultimate ring is very much slen- 

 derer than the one below it, from which it is separated by a large 

 interannular interval, deeper in front than behind on account of the 

 obliquity of its plane. Anteriorly it is very shallow and insignificant ; 

 and it gradually enlarges as it goes backwards. The ring above it 

 is scarcely different, but slightly less obliqup, the interannular in- 

 terval between it and the fifth from the end being slightly less than 

 that next lower down. This fifth ring first gives indications of a 

 latero-posterior deepening, with a corresponding reduction of the in- 

 terannular interval and the formation of an antero-median horizontal 

 fusiform space, the only remains of the iuterannular interval recog- 

 nizable higher up, and extending into the cervical portion of the 

 windpipe. 



Ceriornis temmincki differs from all other Gallinse examiued by 

 me, except Francolinus vulgaris, in that the third bronchial semiring 

 articulates with the second, and so participates in the formation of 

 the specialized organ under consideration. None of the tracheal 

 rings are narrowed ; and there are consequently no interannular in- 

 tervals of any kind, if we except the one on each side of a narrow 

 anterior isthmus which runs between the penultimate and the last 

 ring. This interval is guttate in shape, on account of the slight 

 upturning of the lateral element of the last ring, the antero-median 

 part of which is expanded, almost exactly as in Euplocamus, into a 

 quadrate cartilage. The pessulus at its posterior extremity is un- 

 attached, though situated as usual. Its freedom depends upon the 

 fact that the penultimate as well as the last tracheal ring is incom- 

 plete behind, the end of the pessulus filling the deficiency and just 

 touching the lower margin of the complete antepenultimate ring. 

 This may possibly be the normal arrangement, all others resulting 

 from subsequent consolidation. The first and second bronchial 

 semirings are very much alike. The relations of the upper of them 

 to the ring above, as well as those of the lower to the ring below, 

 are almost identically those of Euplocamus ; whilst posteriorly they 

 consolidate together for one half their length, a small elongate fusi- 

 form interval existing external to their anterior fused extremities. 

 With the lower of them the slightly-bowed third semiring articulates 



