932 JULIA B. PLATT. 
Merely the trunk of the hyoid nerve is outlined, which soon 
divides into three main branches that are distributed to the hyoid 
muscle, and supply in general the lateral innervation of the 
hyoid region. Strong (86, p. 128) says that in the tadpole the 
ramus hyoideus is composed of fibres from two nerves, the 
facialis and glossopharyngeus; and that “ while it is difficult 
to distinguish the two sets of fibres in the ramus hyoideus,” it 
is probable that the fibres from the facialis are those that 
innervate the muscle, and that the cutaneous component is 
derived from the glossopharyngeal vagus complex. It is 
therefore of interest to note that the ramus hyoideus in Nec- 
turus sends fibres to the skin when the nerve is not united 
with the glossopharyngeus. Hence the difficulty which Strong 
acknowledges, in distinguishing the two sets of fibres in the 
tadpole, opens the way to doubt if the cutaneus fibres of the 
hyoideus in Rana may not be in part derived from the facialis. 
Between the mandibularis facialis and the ventral part of the 
hyomandibularis a nerve is outlined which distributes its fibres 
on the dorso-lateral surface of the mouth. The nerve enters the 
ganglion near the root of the hyomandibularis, and I have 
called it an external palatine. It may possibly be the homo- 
logue of one of the palatine nerves described by v. Wijhe 
(38) in the Ganoidei as belonging to the trigeminus. The 
main (internal) palatine nerve is cut short in the reconstruc- 
tion. It enters the ganglion at a deeper level than that at 
which the hyomandibularis arises, and is distributed to the 
roof of the mouth. The nerve is both larger and longer than 
the external palatine. 
The glossopharyngeal nerves arise from the ganglion at the 
same point. The pharyngeal branch is cut short in the recon- 
struction. The dorsal branch explains itself. The main 
branchial nerve is post-trematic, and the distal part runs 
inwards as well as forwards, ending near the axis of the 
embryo. The lateral branchial nerve, which, as in the younger 
embryo, extends backwards and outwards, now fuses with a 
preetrematic branch from the first vagus nerve. This is the 
only pretrematic branch as yet found in Necturus. The two 
