168 JournaL oF CompaRaTiveE NEUROLOGY. 
with the process;.one of these fibrillae (d) joms a small fine- 
meshed network at ¢; the fibrillae coming from the cell at 2 are 
all put into communication with one another soon after they 
enter the neuropil by the network at « Such connecting net- 
works form direct paths for nervous impulses passing from one 
merve element to another, and im entire independence of the 
ganglion cells. These networks have been observed only m 
the processes of the larger cells. Similar fibrillar structures 
have been seen by Berse, whose observations have not as yet 
been published The large single fibrillae which unite with the 
fibrils of the process at right angles often divide forming 
T-shaped branches. Im one case such a fibril was traced into 
direct connection with the process of another nerve element 
(Prentiss, : 03, Figure I9)- 
Figure 1 (Plate V) shows an imteresting case of fibrillar 
continuity within the process of a giant ganglion cell. The 
process is so sectioned as to show only a portion of its cell, but 
may be traced into the neuropil together with the three large 
neurofibrillae which it contains. Immediately within the neu- 
ropil, it is jommed- by two longitudinal fibrillae (2 and 4), which 
branch and unite with two of the fibrillae from the cell; a cross 
fibril, c, puts into direct connection with each other a and &, 
which are fibrillae from the longitudinal commissures and are 
evidently in connection with other ganglia, lying anterior and- 
posterior. A nervous impulse, therefore, which was transmitted 
from the ganglion next anterior to this one, or even from the 
brain, would be conducted through fibril a, stimulate the nerve 
element, and pass at once through cand 4 to the nerve elements 
in the next posterior ganglion. I have never observed such 
commissural fibers branching dichotomously like the dendrites 
of motor elements, but they may constantly be seen in connec- 
tion with cell processes, as in this case. The fibrillar structures 
shown in Figure 1 were stained as opaquely as the fibers in 
Gols! preparations, and since they were situated in a perfectly 
clear space, the connections between the various fibrils were, 
under a magnification of 2000 diameters, as distinct as a dia- 
gram. The further continuations of the fibrillae in the cell 
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