92 GENERA OF SHELLS. 



nitida, fulgurans, mondicaria, turturina, punctata, unifascia- 

 lis, zonalis, — labiosa, avara. 



MiTRA. Shell turreted or subfusiform ; 

 spire pointed at summit ; base emarginated, 

 without a canal. Columella with parallel, 

 transverse plaits, the inferior of which are the 

 smallest. Pillar lip thin, adnate. 



Distinguished from the voluta, by tlie summit cf the 

 spire being quite pointed, and not terminated by a 

 mannneJla, antl l)y the cohmieilar plaits gradually les- 

 sening towards the base. The cohmieilar lip is some- 

 times visible only near the base of the columella. 



M. episcopalis, p:ipalis, poii'tificulis, puncticulata, mille- 

 pora, carJinalis, archiepiscopalis, vcrs;icolor, sanguinolenta, 

 ferniginea, terebralis, adusta, granulosa, crocata, casta, nex- 

 ilis, olivaria, scabriuScnla, granatina, crenifera, serpentina, 

 tœniata, piicaria, corrugata, costc'llaris, lyrata, melongena, 

 cincttilla, vulpecula, cafFra, sanguisuga, sligniataria, filosa, 

 fissurata, lactea, cornicularis, lutesccns, striatula, subiilata, 

 cornea, tringa, meianiana, scutulata, dactylus, fenestrata, 

 crsnuJata, texturata, conulus, liuibifera, auranliaca, ampho- 

 rella, coronata, paupercula, cucumerina, patriarchalis, inuri- 

 culata, torulosa, ebunus, liarpœforinis, semifasciata, retusa, 

 microzonias, ficulina, nudeola, unifascialis, bacillurn, conu- 

 larls, arenosa,c!avulus, litterata, Pcronii, obliquata, plumbea, 

 larva, pisolina, dermestina, granulifera, oniscina, tabanula, 

 pedlculus. 



VoLUTA. Shell oval, more or less ventri- 

 cose, summit obtuse or mammillary, emarginate 

 at base and without a canal. Columella 

 plaited, the inferior folds largest and most ob- 

 lique. No pillar lip. 



