No. 3.] LATERAL LINE OF AMIA. S17 
The remaining organs of the infra-orbital canal, and those of 
the supratemporal cross-commissure, as well as the organs of 
the lateral line, are all supplied by branches arising from the 
ganglion formed on the root of the N. linez lateralis, or from 
that nerve itself. The arrangement here apparently departs 
somewhat from that given by Beard. The root of the N. linez 
lateralis receives its most anterior fibres at this age close to and 
a little above and behind the root of the N. acousticus. Pierc- 
ing the membranes that separate the cranial cavity from the 
labyrinth, it runs directly backward, close to their outer surface 
and just above the posterior branch of the N. acousticus, in 
which there are numerous ganglion cells. It passes through 
the upper part of the main root of the glossopharyngeal, receiv- 
ing there an important addition to its fibres, and, continuing 
backward immediately external to the origins of the anterior 
roots of the vagus, it issues through the main foramen of that 
nerve. In its passage through this foramen, it runs backward 
and outward, crossing the main root of the vagus at a consider- 
able angle, and lying immediately above and closely applied to 
it. It probably receives here also an important addition to its 
fibres, but this could not be traced. 
Immediately outside the foramen it forms a large, well-rounded 
ganglion, which lies directly above, and partly embedded in, the 
first vagus ganglion, but has no commissural connection with it, 
the line separating the ganglia in sections being perfectly sharp 
and distinct. From the proximal part of this ganglion, at its 
extreme anterior end, and almost from the root itself of the 
nerve, a large nerve is given off upward and outward. From it 
a branch is sent to organ 19 infra-orbital, and another, arising 
close to it, to organ 18, the rest of the nerve passing upward 
and medianward to supply the organs of the supratemporal 
commissure and those of the posterior dorsal pit line. The 
branch supplying the pit line is given off immediately beyond 
the. branch to organ 2 of the commissure, thus agreeing in its 
relation to the other branches with that of the large branch sent 
by the R. buccalis to supply the organs of the anterior commis- 
sure, which branch is given off immediately beyond the branch 
to organ 6 infra-orbital, the second one of the suborbital line. 
This dorsal nerve is described by Beard as the supra-branchial 
nerve of the first vagus ganglion. In Amia it is the first dorsal 
