CALYriR^D^. 67 



8. BiLOBATA, f. 108, Gray. — Tenuis, pallide fusca, trifas- 

 ciata, depressa ; apice terminali, septo parviusculo, supra 

 medium emarginato, infra lateraliter profundissime inciso. — 

 The lower notch in the margin of the septum is deeply cut. 

 The shell is of a light texture and light brown colour. 



9. ACULEATA, f. 124, 125, Gmelin. — Ovata subdepressa 

 subspirali alba fusco fasciata, costis spiniferis ornata ; septo 

 subspirali, infra medium producto, ad marginem test89 

 breviter emarginato. — The spines in this species differ in 

 number and size, and the chestnut bands in depth of colour, 

 but a specimen of the species may always be known. 



10. FissDRATA, f. 151, Soivevby. — Breviter subtrigona, 

 convexa, intus castaneo nigrescenti ; apice terminali, unci- 

 nato ; septo producto, lobato, lateraliter jarofimdissime 

 inciso, margine aurantio lineato. — A pretty little shell with 

 dark interior, a very deep notch in the prominently lobed 

 septum, where it joins the side. It has one or two lines of 

 orange colour on its margin. 



11. CONYEXA, f. 109, 110, Say. — Parva ovato-oblonga 

 convexa, succinea, apice terminali ; septo parvo, subtrigono, 

 margine arcuatim recedenti. — An amber-coloured small 

 oval shell, very convex, with terminal apex ; the septum is 

 small and arched recedingly. 



12. MARGiNALis, f. Ill, Brodevip. — Subplanata expansa, 

 versus apicem lineata, intus (nisi ad marginem) vivide cas- 

 tanea, margine aurantio lineata ; septo oblique lobato, apice 

 acute producto, terminali. — The writer has seen specimens 

 of intermediate shells tending to show that the specimen 

 figured in the ' Transactions ' may have been only an acci- 

 dentally flattened growth of C. onyx. 



13. cosTATA, f. 113, 114:, Deshayes. — Ovato-oblonga rugosa, 

 valide distanter costata, carneo-subpurpm-ea ; interstitiis cos- 

 tarum intus exttisque livide castaneis margine deutato ; apice 

 parvo, terminali ; septo latissimo niveo, undulatim fere 

 recto. — Broad ribs and dark interstices, showing within and 

 without, and a strongly-toothed edge, characterise this species, 

 which is unlike any other. 



14. ADUNCA, f. 115, Soiverby. — Capuliformis, fumoso-fusca, 

 dorso convexo ; apice producto uncinato declivi ; septo parvo, 



