152 J. B. Johnston 
tion 324 the two roots enter the ganglion. The motor appears about 
two-thirds as thick as the sensory and the two are quite distinet. 
The ganglion lies immediately upon the front surface of the neuro- 
mast VII! ganglion except for pigment cells which partly separate 
them. There is no interchange or confusion between the two ganglia. 
In 322 a bundle of sensory root fibers crosses ventrad over the 
caudal surface of the motor root and has its ganglion cells in the 
ventro-mesial part of the ganglion. The cells of the trigeminus 
sanglion are distinetly larger than those of the adjacent VII gan- 
glion. Between 334 and 316 two twigs arise from the lateral surface 
ofthe ganglion. The anterior 
Fig. 1. one is somewhat larger and 
arises from the point where 
the profundus ramus is form- 
ing (see below). Both twigs 
run outward, upward and 
backward (Fig. 3) and are 
lost in myosepta on their 
way to the skin of the 
dorsal surface of the head. 
In 322 a small bundle of 
fibers coming from the neu- 
romast VII ganglion is seen 
curving elose round the la- 
teral aspect of the ventral 
portion of the trigeminus 
ganglion. It continues for- 
ward in the capsule of the 
trigeminus ganglion but gradually sends its fibers laterally into 
the loose conneective tissue lateral to the ganglion (Fig. 2 7.0.5). 
In 316 and forward the fibers have nearly all left the capsule 
and a bundle from the lateral surface of the ventral part of the 
trigeminus ganglion curves around the ventral side of those which 
remain and joins the neuromast bundle lying laterally. The com- 
bined bundle continues forward, inclines mesad, approaches the 
line of division between the profundus ganglion and the maxillo- 
mandibular trunk (306—302), inelines meso-dorsally and enters the 
profundus ganglion and trunk (301—297), on the lateral surface of 
which it lies and continues forward (Fig. 1). This combined bundle 
corresponds to the ramus ophthalmieus superficialis: V and VII, as 
