30 F. L. LANDACRE 
8. THE DORSAL LATERALIS GANGLION OF VII 
This large ganglion (figs. 1 and 4, G.L.VIID.) is triangular in 
form with the r. oph. sup. VII arising from its anterior angle, 
the r. bucealis arising from its ventral angle and the root of the 
ganglion representing the third somewhat truncated angle. It 
lies lateral to the Gasserian ganglion, which it conceals in part 
from the lateral view and comes into contact with the distal 
and ventral end of it where the r. max. V andr. mand. V. arise. 
There is, however, no fusion at this stage. On its posterior 
and dorsal border it comes into contact with the anterior end 
of the VIII ganglion. This point of contact consists of a rather 
close fusion in the specimen plotted, but in a 20 mm. embryo 
the line separating the two masses of cells is quite distinet and 
the two roots can be identified up to the point where they enter 
the brain wall. 
The root of the dorsal lateral line ganglion of VI! (fig. 1, 
Rt.L.VIID.) is massive and enters the brain as the most ante- 
rior division of the large root, of which the root of the auditory 
ganglion and those of the remaining ganglia of VII compose the 
posterior division. ‘These relations are not so evident in the 
specimen plotted as in a 20 mm.’ embryo where there is less 
fusion. However they can be made out after seeing them in the 
younger specimen. 
9. RAMUS OPHTHALMICUS SUPERFICIALIS VII 
The r. oph. sup. VII (figs. 1, 2 and 3, R.O.S.VIZ) runs from 
the anterior angle of the dorsal lateralis VII ganglion and forms 
a great semicircle curving around the anterior border of the eye 
and terminating at a point nearly ventral to the middle ot the 
eye and near the olfactory capsule. Its position is always quite 
near the ectoderm. It is a pure lateral line nerve and supplies 
fibers to two large primordia of lateral line organs (fig. 1, L.1 
and 1.2). The first of these lies dorsal to the eye and the nerve 
gives off three well defined twigs, the most posterior of which 
divides as it enters the primordium. This primordium evi- 
dently represents the most posterior organs of the supraorbital 
