686 ALLIES: (VOL. XiL: 
posterior branches, the pharyngeus, in one dissection, separated 
also into two portions, one of which accompanied each of the 
two branches of the palatinus. In other dissections this 
separation was not evident, the pharyngeus glossopharyngei 
accompanying the anterior branch of the facialis and issuing on 
the ventral surface of the vomer to be distributed to dermal 
tissues there. The nerve as it passes the external opening of 
the pseudobranchial canal lies median to that opening, and 
hence in all probability takes no part in the innervation of the 
pseudobranch. 
The ramus pretrematicus glossopharyngei, after separating 
from the ramus pharyngeus, turns outward and forward along the 
under surface of the adductor hyomandibularis, and when near 
the anterior edge of that muscle, and close to the hind edge of the 
pseudobranch, turns outward, downward, and backward along the 
under surface of the muscle, and then along the inner surface 
of the hyomandibular and symplectic. In this part of its course 
it lies ventral to, or even in front of, the truncus hyomandibularis 
facialis, and approximately parallel with it and with the ramus 
hyoideus facialis. It sends several branches forward and back- 
ward to the dermal tissues on the under surface of the hyoman- 
dibular, passes beyond the hind edge of the symplectic, and 
then turns downward and forward in the dermal fold between 
that bone and the upper end of the ceratohyal. At this point, 
in larvae, branches of the nerve were traced into the terminal 
buds found in the lining membrane of the mouth cavity. The 
nerve, in larvae, passes dorsal to the pseudobranchial canal, 
dorsal to the hind end of the pseudobranch, lying close to that 
organ. No branches of the nerve could be traced directly to 
the organ, but a branch was found distributed to the wall of 
the spiracular cleft. 
The ramus posterior, or posttrematicus, glossopharyngei runs 
downward, outward, and backward in front of the levator arc. 
branch. int. anterior and the levator arc. branch. ext. primus, and 
then along the anterior portion of the upper surface of the first 
arch. From the posterior edge of the nerve at its base, or 
from the outer surface of the main ganglion itself, one or two 
small branches are sent backward to the inner surface of the 

