ON THE TRACHEA OF THE GALLINZE. 485 
thinned antero-lateral element of the last ring has a slight special 
downward curve towards its inner end. In Oreortyz there is an indica- 
tion of the same. The second bronchial semiring is prolonged inwards 
pointedly in front, and posteriorly does meet the first semiring to 
articulate slightly with it. 
In Coturniz communis, with which CO. coromandelica agrees in every 
respect, the posterior surface of the intrathoracic portion of the trachea 
is seen to be formed by rings between which no interannular intervals 
exist, except as transverse lines. Anteriorly, however, the rings are 
very much thinner, becoming so abruptly at the side of the tube, and 
the intervals between them are nearly twice their depth, even more 
than that towards the bifurcation of the tube. Narrow medio-anterior 
perpendicular isthmuses of fibrous tissue connect the lowermost six 
rings. Laterally the penultimate ring is slightly upturned, more 
behind than in front. The antero-lateral thin portion of the circum- 
ference of the last ring is decidedly convex downwards, as is also the 
first bronchial semiring and the second. The last tracheal ring sends 
downwards a medio-anterior oblong process, ossified in the adult, to 
the lower angles of which the first semirings articulate by their Page 362. 
equally lengthy extensions inwards beyond the short articular pro- 
Fig. 9. Fig. 10. 
= 
2 
= 
\—{ 
a hr se ili 
Front view. Back view. 
Coturnix communis. 
