268 
one behind the other, and with these the 
nervous cord terminates. All the gan- 
glionic disks are connected by a pair of 
ribbons, generally lying in such close 
proximity as to appear to be single and 
straight, but anteriorly they are separa- 
ted somewhat widely. 
In leaving the suboesophageal gan- 
glion, the nervous ribbons run nearly 
parallel, or only slightly curved outward, 
to the first body-ganglion. Starting 
again close together at the middle of the 
posterior border of the first ganglion 
they diverge in straight lines, but very 
gradually, for fully two-thirds the distance 
to the second ganglion (which is twice 
as far removed from the first as the first 
is from the suboesophageal ganglion), 
where they are nearly twice as far apart 
as the width of the first ganglion, and 
then converge more rapidly and enter 
the second ganglion at its outer anterior 
border. The distance from the second 
to the third ganglion is effected in a 
similar manner, the distance from the 
second ganglion to the point of greatest 
divergence being about equal to the dis- 
tance between the first and second gang- 
lia. The fourth ganglion is but little 
removed from the third, being in fact 
nearer to it than the latter is to the point 
of greatest divergence of the ribbons in 
advance of it; between these two gan- 
glia the ribbon is straight, slightly longer 
than broad, broader than at any point 
posteriorly, and its separation into two 
cords is not readily seen. Behind this 
the ganglia are nearly equidistant (up to 
those of the seventh abdominal segment) 
and connected by a straight double rib- 
bon, scarcely broader than either one of 
PST CWE. 
the cords between the second and third: 
ganglia, and which is seen to be double. 
only by the slight divergence of the 
cords in advance of each ganglion, as 
they enter it. The last ganglion is 
situated in the seventh abdominal seg- 
ment, just posterior to the tenth ganglion ; 
indeed the two appear almost to coalesce 
at their adjoining edges; the eleventh is: 
slightly the larger of the two. From 
the second abdominal segment backward, 
the nervous cord does not come in direct 
contact with the alimentary canal, but 
considerable fatty tissue is interposed 
between them; in advance of this, how- 
ever, the reverse is the case, the fatty 
tissue appearing as. if strapped in its 
place between the nervous cord and 
the integument by the branches of the 
former. 
From each side of each abdominal 
ganglion two lateral nerves are emitted, 
the anterior at right angles, the posterior 
in a slightly posterior: direction, and at 
their bases the two are connected by a 
delicate film. In the thoracic segments 
a. similar rule holds, but inthe first 
ganglion only the anterior lateral. nerve. 
is present, and it is directed forward ; the 
third ganglion on the other hand fol- 
lows the rule of the abdominal ganglia, 
while in the second, the nerves are con- 
fluent at their origin, directed at right 
angles outward, and almost immediately 
diverge at right angles to each other, one 
forward, the other backward. In addi- 
tion to the lateral nerves, the terminal 
ganglion is furnished with two pairs of 
longer and _ stouter posterior nerves, 
reaching into the hinder segments, the 
outer cords trending somewhat outward. - 
