a. anus. 
ao. aorta. 
a.p. anterior pedal gland. 
b. brain. 
b.c. blood corpuscles. 
b.n. buccal nerves. 
br. gills. 
c. intestinal coecum. 
C.a. Cirrose area. 
c.c. ciliated crypt. 
cl. cloacal chamber. 
c.m. circular muscles. 
c.o. copulatory organ. 
c.p. pericardial tube of coelomoduct. 
cut. cuticula. 
d.gl. duct of salivary glands. 
d.s.g.dorsal salivary gland. 
e. septum of the radula. 
ep. epidermis of ventral folds. 
g.c. giant cell. 
gl. glands of pharynx. 
gon. gonad. © 
i. heart. 
h.p. hypodermis papilla. 
it. intestine. == 
lm. longitudinal muscles. 
In. lateral nerves. 
ABBREVIATIONS IN THE TEXT OF THE PLATES. 
l.p. lateral part of radula. 
m. muscles. 
o. mouth. 
oe. oesophagus. 
per. pericardium. 
p.g. preanal gland. 
ph. pharynx. 
ph.c. pharyngeal cavity. 
p.i. precloacal invagination. 
p.n. pedal nerve. 
p.p. posterior pedal gland. 
PU hacia: 
ri, r2. median, lateral divisions of 
radula. 
rs. receptaculum seminis. 
s. spermatids. 
s.c. subradular commissure. 
s.g. shell gland. 
s.o. sense organ. 
sp. spicula. 
t. tooth. 
t.m. transversal muscles. 
V. vesicula. 
v.b. ventral blood sinus. 
v.f. ventral fold. 
v.s. vesicula seminalis. 
v.s.g. ventral salivary gland. 
