GANGLIA AND NERVES OF SQUALUS 33 
ganglia in the reverse order, 1.e., the root of theventral lateralis 
is lateral and somewhat posterior in position and in their course 
from the ganglion to the brain wall they cross so that the root 
of the ventral lateralis ganglion enters more anterior than that 
of the geniculate and motor portion of the r. hyomandibularis. 
The sensory and motor fibers of the combined geniculate and 
motor root could not be followed separately, since they form a 
compact bundle. 
12. THE AUDITORY GANGLION AND RAMI 
The auditory ganglion (figs. 1 and 5, G.Auw.) will be treated 
first, since its relations are much simpler than those of the re- 
mainder of the complex. The ganglion is well isolated through- 
out most of its extent, especially in the 20 mm. stage, and its 
ventral and anterior boundary, which is the one in contact 
with the remainder of the complex, can be recognized up to the 
point where it comes into contact with the posterior border of 
the dorsal lateralis VII; from this point the two masses of enter- 
ing fibers are distinct but their accompanying cells cannot be 
distinguished. The most anterior ramus arising from the audi- 
tory ganglion, enters the auditory vesicle on its ventral and 
lateral border, while the more posterior rami enter the vesicle 
on the posterior and mesial border. The undeveloped condi- 
tion of the auditory vesicle makes it difficult to identify these 
rami definitely, since the sensory areas of the auditory vesicle 
are not differentiated. The more anterior ramus seems to be 
connected with the saccular portion and thetwo posterior rami 
with the utricular portion. 
13. THE GENICULATE GANGLION 
The geniculate ganglion (figs. 1 and 5, G.Gen.), the most an- 
terior ganglion of the VII and VIII complex, as mentioned 
above under the general discussion of the VII and VIII com- 
plex, lies ventral and slightly mesial tothe ventral lateralis VII. 
The ganglion can be identified throughout its whole extent, 
although it is in contact with the ventral lateralis VII. At the 
