4 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 
occupy the sides of the bell and extend to the margin. Immediately 
below the gastric ostia, and in the bell cavity, are the suspensoria, one 
in each perradius. These support the floor of the stomach much as the 
frenula support the velarium, except that the suspensoria are placed 
under the shelf (to continue Conant’s figure) and not above it as are 
the frenula. 
A nerve ring, underneath the epithelium of the subumbrella, 
passes from near the origin of each pedalium at the margin to the 
origin of the peduncles of the sensory clubs, a little above the margin, 
giving off a branch to each club. Eight ganglia are found in the 
course of this nerve. The four pedal ganglia lie near the bases of 
the pedalia, and are hence interradial; the four radial ganglia lie 
near the bases of the peduncles of the clubs, and are perradial. <A 
small nerve, radial nerve, can be traced a short distance upwards 
from each radial ganglion. Underlying the epithelium of the frenula 
and the suspensoria are ganglion cells and nerve fibers in larger 
numbers than elsewhere (excepting the ganglia mentioned) in the 
subumbrella. Otherwise, ganglion cells and nerve fibers underlie the 
epithelium of the subumbrella, including the inner surface of the 
velarium, as also do muscle fibers, except in the perradii and in the 
region of the nerve, where the latter become interrupted. 
