16 i F. L. LANDACRE 
(b). The epibranchial placode is added to the one identified 
as geniculate, or general visceral, as in the IX and four branchial 
ganglia of the X. 
(ec). The ramus palatinus, which does not contain lateralis 
fibers in any type, arises from the geniculate. 
(d). The ganglion identified as ventro-lateral seems to send 
all its fibers into the hyomandibular. 
(e). Inthe later stages of the ventro-lateral ganglion it assumes 
a position more ventral and posterior to the geniculate as in Meni- 
dia and in Ameiurus. 
The auditory ganglion 
The auditory ganglion (fig. 1) is a large comma-shaped mass 
with the large end directed forward and the smaller end extend- 
ing caudad. The large anterior end is closely attached to the 
posterior end of the geniculate and to the ventro-lateral VII. 
The root enters the medulla from the anterior end and a fibril- 
lated trunk enters the auditory capsule at the middle region of 
the ganglion. 
The glossopharyngeus: ganglion (petrosal and lateralis portion) 
This ganglion (figs. 1 and 10) is club-shaped with the large end 
projecting forward and downward and is attached at its extreme 
anterior end to a mass of cells (placode II) proliferated from the 
ectoderm at the posterior and dorsal portion of the pharyngeal 
pocket of the first true gill. The posterior attenuated portion 
arches up around the posterior surface of the auditory capsule 
and enters the medulla at a point almost directly dorsal to the 
anterior end of the ganglion. Just before it enters the medulla it 
passes into a well defined mass of cells. This is not a ganglion 
however, since in later stages there are no ganglion cells in this 
position and the thickness of the root at this point as shown in 
fig. | is undoubtedly due to the exit of motor fibers and the pres- 
ence of the root of the lateralis X ganglion which enters at this 
point. After the lateralis X root becomes more completely 
