S7 
The nerves passing to the mandibles have their origin 
on the anterior margin near the middle line. They 
course along the muscles of the ceesophagus, and reach the 
mandibles near the base of the mouth. 
The next pair of nerves arise at the anterior angle of 
the ganglion, course forward, under the nerves of the 
antenne and antennules, to the frontal plate which they 
enter about midway between the lateral margin and 
middle line. They then turn abruptly and pass out to 
the lateral margins of the frontal plate, just above the 
antennules. The margin at this point is destitute of the 
transparent membrane which surrounds the carapace. 
The nerves terminate in a shallow cup, evidently a 
sensory organ. 
Three other pairs of nerves arise from the anterior 
angles of this ventral ganglion. The first passes to the 
rudimentary first pair of maxille, the second, a short 
nerve, passes to the second pair of maxille, and the third 
to the muscles controlling the lateral margins of the 
cephalo-thorax. 
The nerves supplying the first pair of maxillipedes arise 
from the anterior portion of the lateral margin. They 
are large nerves at their origin, but immediately divide 
into four branches, passing to the maxillipedes and 
muscles. The second pair of maxillipedes are also supplied 
by nerves arising from the lateral margins. Like those 
of the first maxillipedes they have strong roots, and at 
once divide into three branches which pass to the second 
maxillipedes and their muscles. 
The remaining nerves have their roots in the posterior 
end of the ganglion. There are three pairs. These 
supply the five pairs of feet and the abdomen. The outer 
pair of nerves supply the first pair of feet. Near the 
origin a branch is given off which passes to the muscles 
