144 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
nerves, which differ in size and distribution. The one on the 
left side (13) is small and runs directly back to the body wall, 
while the one on the right side (11) is large and runs to the 
genital ganglion, one of the branches of which (12) corresponds 
in distribution to the whole left nerve. 
The visceral ganglia are situated back of the pedal, just 
below the pleural, to which they are closely attached. The right 
is larger than the left (about 100 microns in diameter) but 
there is a distinct ganglion which sends a small nerve (25) to 
the mucus gland. This is a slightly different arrangement than 
any observed by Elliott, or Hancock and Hmbleton, as they 
figure only one visceral ganglion, the right, which they consider 
a fusion of the various visceral ganglionic centers. The right 
visceral ganglion sends off three nerves, as does the unpaired 
visceral ganglion of other species, but two of these are ex- 
tremely small. The shortest (19) goes back along the albumen 
gland; to which it gives nerves and finally enters the liver- 
mass near the csophagus. The next in size (20) gives off a 
branch (21) which goes in the direction of the genital ganglion, 
although I was not able to determine whether it actually joins 
this ganglion. The main nerve then continues back beside the 
posterior pedal nerve, giving off branches to the mucus gland, 
then changes its course, gives a branch to the intestine, and 
finally divides into two branches, one going to the hermaphro- 
dite gland and the other to the nephridia. The largest nerve 
(18) gives branches to the aorta and blood gland, continues 
back beneath the heart, to which it gives a branch, gives 
branches to the nephridia, and nephridial valve, and finally 
joins the central ganglion of the branchial plexus. 
The optic ganglia are very small (about 50 microns) ovoid, 
and attached to the upper surface of the cerebral by short 
connectives. They give off very minute nerves to the eyes. 
The accessory nervous system was only determined in certain 
portions, since the nerves are very fine and run in a complex 
mass of muscles, connective tissue, and glands, and special 
methods could not be employed because of lack of material. 
The gastro-heptic plexus is apparently much reduced, as no 
