DESCRIPTION. 
165 
variegated with scale-like spots of brilliant white ; 
yellowish towards the margin, vertex white, lateral. 
Inhabits Africa. 
Fig. 8. P. Graca. 
Shell ovate, convex; margin crenulate within. 
Lister Conch. Tab. 327. Fig. 1, 2. 
Specimen white, with ten dull red rays ; thick, 
covered with decussate strise ; internally white and 
smooth; perforation oblong. 
Inhabits the shores of Europe, 
— -4 
PLATE XXII. 
Fig. 1, Dentalium elephantinum. 
Shell with ten angles, somewhat bent, striate. 
Lister Conch. Tab. 547. Fig. 1. 
Specimen pale green, obscurely annulate on the 
outside, with darker shades ; apex white ; within 
smooth ; ribs projecting. 
Inhabits the Indian and European seas. 
Fig. 2. Serpula lumbricalis. 
Shell round, flexuous ; apex spiral, acute , 
Lister Conch. Tab. 548. Fig, L 
