ANATOMY AND HISTOLOGY OF ZLIMAX AGRESTIS. 169 
EXPLANATION OF THE PLATES. 
[The figures have been drawn under Zeiss A, D and F. 
As several of them have been reduced in size, I give only 
the number of diameters. | 
b. buccal mass. 
b.c, buccal cavity. 
b.g. buccal ganglion. 
c. cartilage, supporting the 
radula, 
cr. crop. 
cu. cuticle. 
d. ducts of Semper’s organ. 
dv. diverticulum of buccal 
cavity. 
f. foot. 
g.c. ganglion cells. 
gl. gland cells. 
7. upper jaw. 
l. lacunae. 
1.l. lateral lip. 
m. mantle. 
m.c. mesoderm cells. 
m.g. mucous gland. 
mm. muscles. 
2. Nerves. 
n.c. nerve collar. 
n.t, nerve going to upper 
tentacle (optic nerve). 
n.t’. nerve going to lower 
tentacle. 
o. mouth. 
oe. oesophagus. 
p. pedal gland. 
p.g. pedal ganglion. 
p.n. pedal nerves. 
r. radula. 
s. salivary gland. 
$.c. Supra- oesophageal 
commissure. 
s.d. duct of salivary gland. 
s.g. Supra- oesophageal 
ganglion. 
s.o. Semper’s organ. 
s.z. sensory cells. 
t. upper tentacle. 
t’. lower tentacle. 
v.g. visceral ganglia. 
v.n. visceral nerve. 
