166 J. B. Johnston 
4 1ying side by side; then roots 5 and 6, and then root 7; further 
dorsally and distinet from them, the ganglion of root Za. Now there 
appears in the same section (441) and the next four following, a 
few ganglion cells lying in contact with the dorsal surface of roots 
5, 6 and 7 and extending up mesial to the lateral line ganglion, 
crowded between it and the eranium. The lateral line ganglion has 
a strong sheath separating it from these cells. The cells are con- 
nected with the brain by two small roots ($ and 9) from the spinal 
Vth tract in sections 440 and 446. The two roots unite in the group 
Fig. 10. Fig. 11. 
of cells as a common ganglion. From these cells a very small ramus 
goes dorsad mesial to the lateral line ganglion and close upon the 
‚surface of the eranium. The remainder of the cells contribute fibers 
to the vagus trunk which is forming. At 448.a common trunk is 
formed in which three parts, 75—4, 5—6, and 7—($—9), are dist- 
inguishable, but in 450 these parts are no longer marked off from 
one another. This is the common vagus trunk (Fig. 13 tr.epib.). 
Nervus lineae lateralis. At 450 the larger part of the 
VII—X anastomosis enters the lateral part of the ganglion. The 
last ganglion cells are at 461. The trunk continues caudally and 
gradually rises dorsally, lying at first somewhat ventral to the spinal 
eord, then for some distance lateral to it, and finally becoming 
