469 
under the anterior extremity of the Auditory ganglion and partly an- 
terior to it. From the anterior end of this ganglion emerges the R. 
palatinus which then dips downward piercing the roof of the mouth and 
proceeding forwards along the latter. Laterally to this and also from 
the ganglion near its extremity a small branch is given off which 
passes directly outward and forms the most ventral portion of the 
trunk of the VII. It soon separates, proceeding outwards and down- 
wards to the side of the oral cavity where it proceeds forwards along 
it and along the inner side of the lower jaw. It is thus in every 
respect, except that it is not pushed forwards into the V, identical 
with the R. mandibularis of Anura, thereby confirming the view that 
the latter is derived from the Fasciculus communis. 
The ventral root, or rootlets, of the VII (VII ab) could, in part at 
least, be traced out and forms the portion of the trunk of the VII, 
as it passes outward, which lies immediately above the Fasciculus 
communis branch just described. Though fused with the latter and 
with a part of the dorsal VII (VIIb), mentioned below, it can yet be 
traced continuously until it likewise separates and is distributed to the 
Mm. digastricus and mylohyoideus posterior, corresponding to the motor 
branches of the Hyomandibular in Anura and showing the derivation 
inferred for them in the latter to be correct. 
The dorsal VII (VILb) divides soon after its exit, part passing 
directly cephalad along the dorsal side of the Gasserian ganglion. It 
is here this part enters its ganglion which is fused with the Gasserian 
ganglion proper. The ventral half of the dorsal VII passes downwards, 
as well as forwards, and then bends outwards directly under the au- 
ditory capsule and just anterior to the entrance of the anterior branch 
of the VII into the capsule. It here fuses with the other components 
of the VIII mentioned, forming the dorsal part of the trunk. In this 
part of its course and under the outer edge of the auditory capsule it 
passes into its ganglion, composed of large ganglion cells. It is a 
cutaneous nerve and probably, as in the Tadpole, supplies the lateral 
sense organs. These are here more irregularly arranged. 
Thus the dorsal VII has two ganglia, one on each of its two main 
divisions, while the Fasciculus communis component has one, at its 
point of forking. The motor portion (VII ab) is, of course, non-gan- 
glionated. : 
A few of the bearings of the above may be here noted: 
Conclusions. 
1. In the previous communication it was suggested (p. 8) that 
