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Epic, epicuticula (periostracum) 

 F.tri. tricuspid body. 

 Go. right gonad. 

 Ga.c. right cerebral gangUon. 

 Gn.sp. parieto-splanchnic gang- 

 lion. 

 Ga.p. pedal ganglion. 

 Ga.op. optic ganglion. 

 Lig. hinge ligament. 

 Lith. otolith. 

 M. mouth. 

 Mn. mantle lobe. 

 Mu'. cut edge of mantle lobe. 

 Mii.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.6. 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.J}. I. long, 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.j^-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.d. 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. 

 Ret.a'. scar of attachment of 



anterior retractor. 

 Bet.p. posterior retractor pedis. 

 i?e^.^j'. posterior retractor pedis 



impression. 

 Ret. VI. retractor muscles of the 



mantle edge. 

 Bet.vi'. 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. 

 Be7i'. external opening of renal 



organ (ureter). 

 Ben.p)er. 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. 



