956 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Epic. epicuticula (periostracum) 
F.tri. tricuspid body. 
Go. right gonad. 
Ga.c. right cerebral ganglion. 
Ga.sp. parieto-splanchnic gang- 
lion. 
Ga.p. pedal ganglion. 
Ga.op. optic ganglion. 
Ing. hinge ligament. 
Inth. otolith. 
M. mouth. 
Mn. mantle lobe. 
Mn'. cut edge of mantle lobe. 
Mn.1. anterior prolongation of 
intersiphonal partition. 
M.c.1. anal division of mantle 
cavity. 
M.c.2. cavity of dorsal siphon. 
M.c¢.8. 
M.c.4. 
general mantle cavity. 
ventral suprabranchial 
cavity. 
M.c.5. dorsal suprabranchial 
| cavity. 
M. vit. 
M.p.1. straight transverse pedal 
vitelline membrane. 
muscles. 
MEDC. 
M.p.o. 
M.p.l. long. pedal muscles. 
circular pedal muscles. 
oblique pedal muscles. 
N.add. nerve supplying ant. 
| adductor. 
‘N.br. branchial nerve. 
N.pa. ant. com. pallial nerve. 
N.pp. post. com. pallial nerve. 
N.p.1. external pallial nerve. 
N.p.2. median pallial nerve. 
N.p.3. internal pallial nerve. 
N.t. tentacular nerve. 
Pro. protractor pedis. 
Pro’. protractor muscle im- 
pression. 
Pa.d. dorsal labial valp. 
Pa.v. ventral labial palp. 
Ped.1. proximal limb of the 
viscero-pedal mass. 
Ped.2. distal limb ,, 
Per. pericardium. 
” 
fet.a. anterior retractor pedis. 
fet.a'. scar of attachment of 
anterior retractor. 
fet.p. posterior retractor pedis. 
fet.p'. posterior retractor pedis 
impression. 
fet.m. retractor muscles of the 
mantle edge. 
Ret.m'. impression of retrac- 
tors of mantle edge. 
ftet.s. retractor muscles of the 
siphons. 
fiet.s’. impression of retractors 
of the siphons. 
Fen. renal organ. 
fen'. external opening of renal 
organ (ureter). 
fen .per. reno-pericardial canal. 
Sz.d. dorsal or exhalent siphon. 
Sz.v. ventral or inhalent siphon. 
Sh.e. outer shell layer. 
Sh.z. inner shell layer. 
Sin.p. posterior pedal sinus. 
Sin.ren, renal sinus, 
St. crystalline style. 
