530 F. M. MacFarrann, 
. the esophagus to the buccal ganglia, Iying immediately beneath, just 
behind the point of exit of the esophagus from the pharynx. The 
buccal ganglia are shown in the lower portion of Fig. 24 of Pl. 32. 
The buccal commissure is relatively long and the ganglia thus widely 
separated. T'wo postero-ventral nerves pass directly into the bulb 
from the ends of the commissure to the muscles of the rotula. 
Numerous nerve cells are borne upon the nerves from this ganglion 
pair and the groups shown in the figure constitute probably the 
stomato-gastric ganglia, though other scattered nerve cells are found 
all along the nerves from the buccal ganglia, as well as in the 
immediate vicinity of these figured. 
Three pairs of nerves arise from the pedal ganglia. These are. 
pl, the anterior pedal nerve, which arises from the ganglion 
at its outer anterior margin, divides into three main branches and 
is distributed to the anterior end of the foot. 
p2, a large nerve on the right side, much smaller on the left. 
It arises from the outer anterior face of the ganglion, and on the 
left side is distributed to the median body wall and foot. On the 
riecht side it sends several branches which innervate the retractor 
muscle of the preputium, and the distal loops of the vas deferens, 
and the penis, together with the adjacent body wall. 
Below the esophagus the ventral portion of the nerve collar is 
made up of the cerebro-buccal loop, the pedal (p.c) and the para- 
pedal (p.p.c) commissures, and the pleural (pl.c) or visceral commis- 
sure. The pedal and parapedal commissures are united together in 
a broad band and constitute together the strongest loop. The 
pleural commissure arises from the postero-ventral face of the pleural 
ganglia and forms a loop around the esophagus of some length. It 
gives rise to a good sized unpaired genital nerve (n.g) from its 
richt portion, and a pair of more slender nerves in addition, which 
are distributed to the viscera. These nerves have conspicuous 
ganglion cells at their origin from the commissure and Scattered 
along their course. 
Reproductive system. The hermaphroditie gland of Dirona is 
divided into six to eight hemispherical or prismatic lobes which are 
lodged among the lobes of the liver and the loops of the alimentary 
canal in the posterior visceral complex. Two of these lobes are 
visible upon the dorsal surface, near the median line, one in con- 
tact on its left with the pyloric end of the stomach, the other be- 
hind the same. Upon the right and ventral sides the remaining 
