ON THE TRACHEA OF THE GALLINZ. 483 
and a posterior) of no great length to articulate with the last tracheal 
ring, the second semiring (scarcely differing from the third) just 
touching its two angles sufficiently for it to be said that it does 
articulate with it. In this species the lateral sterno-tracheal muscle 
terminates inferiorly in a peculiar manner. It is constituted of two 
parts, an outer and an inner. Of the inner, which is also divided 
below into two, the median portion ceases at the twelfth ring from 
the bifurcation, opposite which spot its outer moiety sends down- 
wards a special thin extra broad fasciculus to join the undivided outer 
main element of the muscle just before it leaves the windpipe, opposite 
its antepenultimate ring. The nerve to these lower fibres is not 
small; and from being superficial—resting as it does on the muscles 
under consideration as they descend—it disappears behind the special 
fasciculus above described at the spot where that begins to run inwards 
towards its fellow, which it does not meet. 
In Lophortyx californicus (adult male) there are no interannular 
intervals on the posterior aspect of the intrathoracic portion of the Page 360. 
Fig. 7. Fig. 8. 
Front view. Back view. 
Lophortyx californicus. 
