Page 363. 
486 ON THE TRACHEA OF THE GALLIN#. 
cesses for the second semirings. The posterior articulations of the 
incomplete last tracheal ring with the first semiring, and of that with 
the second on each side, are considerable, and much the same in detail 
as in Caccabis. The pessulus blends with the penultimate ring behind. 
The lateral intervals between the penultimate and last rings are plano- 
convex, the plane-side being uppermost; those between the last ring 
and the first bronchial semirings are meniscoid, very deep, and concave 
upwards. Between the first and second semiring the interval is small, 
elongate, and curved like the one above it. 
Ptilopachys ventralis differs very little from Ootwrniz in this part of 
its windpipe. 
Rollulus coronatus closely resembles the Ortyges and Quails. There 
are five fairly deep antero-lateral interannular intervals between the 
lowermost six tracheal rings, these same rings meeting in the middle 
line in front as well as through all the posterior moiety of the circum- 
ference. Ossification extends through the median fused anterior 
portions of the penultimate and last tracheal rings, as well as a short 
distance posteriorly into the middle of the lower border of the penulti- 
mate ring from the fair-sized bony pessulus. The last tracheal ring 
sends downwards a thick short process from its hinder end on either 
side, to articulate with the equally developed upturned posterior 
extremity of the first bronchial semiring, the anterior upward- and 
inward-directed terminal limb of which is proportionately long, at the 
same time that the angle it makes with the main element of the ring 
is very abrupt. The second semiring is nearly in contact superiorly 
with the first throughout its length. Anteriorly it ends in a point, as 
do the lower semirings, which extends a short distance into the inner 
membranous wall of the bronchus. Posteriorly it is slightly enlarged 
and rounded, ceasing a short distance outside the posterior angle of 
the semiring above, with which it is in contact. 
Turning to the genus Huplocamus, in Huplocamus swinhoit the last 
four tracheal rings become slightly enlarged from above downwards. 
Between the simple antepenultimate ring and the one above it there is 
a slight interval, except in the middle line behind, where a general 
fusion of the last three rings occurs, as in all Huplocami. The penul- 
timate ring sends downwards a narrow tongue-shaped median process 
anteriorly, which touches, but does not join, the upper margin of the 
there indented terminal tracheal ring. Its upper margin is also 
slightly irregular. The last ring is peculiar in front. Besides the 
shallow and broad concavity in the middle of its upper border, it sends 
downwards a deep and transversely considerable semiovoid process, 
notched at its apex, which is lowermost, to form the median element 
of the actual bifurcation of the tube. On either side of this notch, 
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