239 
anatomy of the mole-cricket. 
ganglion gives off several pairs of nerves, of which by far 
the largest pair may be traced into the caudal antennae. The 
second, third, and fourth ganglions are smaller than the 
first, and are of an oval rather than a globular form : they 
each send out from two to four or five pairs of nerves. The 
fifth and sixth ganglions of which the former is the smallest, 
the latter the largest ganglion, of the whole series, are situ- 
ated so closely together, that it not always easy to demon- 
strate the connecting medullary cords. The sixth ganglion, 
which from its size and the number of nerves radiating from 
it might be called the solar ganglion, is situated between 
the roots of the posterior legs. The seventh and eighth gan- 
glions are situated respectively between the roots of the 
middle and the fore legs. 
From the eighth ganglion, which lies under the furcular 
• bone of the sternum, two parallel medullary cords pass on to 
the root of the mandibles, where they unite with the ninth 
and last ganglion, which is situated under and in contact 
with the commencement of the esophagus. This ganglion, 
which is hollow, as perhaps all the others may be, sends off 
nerves to the maxilla and adjacent parts ; and it sends off 
besides, two large and important branches which ascending 
on each side of the esophagus unite with two corresponding 
branches that descend from the brain ; which organ is situ- 
ated immediately in contact with the commencement of the 
esophagus on its upper surface : so that the esophagus is 
placed between the ninth ganglion on its lower surface, and 
the brain on its upper surface, their connecting branches 
completing the nervous collar which surrounds it at this 
part. 
