79 



Epic, epicuticula (periostracura) 

 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. 

 Lig. hinge ligament. 

 Lith. otolith. 

 M. mouth. 

 Mn. mantle lobe. 

 Mn' . cut edge of mantle lobe. 

 Mn.l. anterior prolongation of 



intersiphonal partition. 

 M.c.l. anal division of mantle 



cavity. 

 M.c.2. cavity of dorsal siphon. 

 M.c.3. general mantle cavity. 

 M.c.4. ventral suprabranchial 



cavity. 

 M.c.5. dorsal suprabranchial 



cavity. 

 M.vit. vitelline membrane. 

 M.p.i. straight transverse pedal 



muscles. 

 M.p.c. circular pedal muscles. 

 M.p.o. oblique pedal muscles. 

 M.p.l. long, pedal muscles. 

 N.add. nerve supplying ant. 



adductor. 

 N.br. branchial nerve. 

 N.2>a. ant. com. pallial nerve. 

 N.pp. post. com. pallial nerve. 

 N.p.l. 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.cl. dorsal labial palp. 



Pa.v. ventral labial palp. 



Ped.l. proximal limb of the 

 viscero-pedal mass. 



Ped.2. distal limb ,, ,, 



Per. pericardium. 



Bet. a. anterior retractor pedis. 



Bet.a'. scar of attachment of 

 anterior retractor. 



Bet.p. posterior retractor pedis. 



Bet.})', posterior retractor pedis 

 impression. 



Bet. m. retractor muscles of the 

 mantle edge. 



Bet.m'. impression of retrac- 

 tors of mantle edge. 



Bet.s. retractor muscles of the 

 siphons. 



Bet.s'. impression of retractors 

 of the siphons. 



Ben. renal organ. 



Ben' . external opening of renal 

 organ (ureter). 



Ben.per. reno-pericardial canal. 



Si.d. dorsal or exhalent siphon. 



Si.v. ventral or inhalent siphon. 



Sh.e. outer shell layer. 



Sh.i. inner shell layer. 



Sin.p. posterior pedal sinus. 



Sin.ren. renal sinus. 



St. crystalline style. 



