130 
SPECIFIC 
Lister Conch. Tab. 351. Fig. 189. 
Specimen clear white; gape of the posterior 
slope lanceolate, the circumference of which is 
tumid and crenate; margin of the shell deeply 
crenate ; .hinge furnished with an anterior tooth 
besides the usual callus. 
Inhabits the Indian Ocean. 
Fig. 3. Hinge of Arc a granosa. 
Fig. 4. Kb.cPl tortuosa. 
Shell parallelepiped, striate ; larger valve ob- 
liquely carinate. 
jy Argenmlle Conch. Tab. 19. Fig. 1. 
Specimen white ; striated longitudinally and 
transversely ; valves dissimilar, much twisted ; 
margin subcrenate. 
Inhabits the Indian Ocean. 
Fig. 5. A. Nocc. 
Shell oblong, striated, emarginate at the apex, 
beaks remote, margin gaping. 
Lister Conch. Tab. 368. Fig. 208. 
Specimen white and brown, rhomboidal ; exter- 
