multispiral shell

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top shell — noun 1. : any of various marine snails constituting the family Trochidae and having a spiral and usually regularly conical shell marked by a flat base and rhombic aperture and a multispiral operculum and sometimes used to make pearl buttons 2. :… … Useful english dictionary
Operculum (gastropod) — Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place … Wikipedia
Marstonia comalensis — Shell of one of the lectotypes of Marstonia comalensis. Scale bar is 1.0 mm. Scientific classification Kingdom … Wikipedia
Calliostoma tigris tigris — Taxobox name = Calliostoma tigris tigris image caption = regnum = Animalia phylum = Mollusca classis = Gastropoda ordo = Archaeogastropoda familia = Calliostomatidae genus = Calliostoma species = C. tigris subspecies = C. tigris tigris trinomial … Wikipedia
Maoricolpus roseus roseus — Taxobox name = Maoricolpus roseus roseus status = regnum = Animalia phylum = Mollusca classis = Gastropoda infraclassis = Apogastropoda superordo = Caenogastropoda ordo = Sorbeoconcha subordo = Cerithiimorpha superfamilia = Cerithioidea familia … Wikipedia
Turritella — Tur ri*tel la, n. [NL., dim fr. L. turris tower.] (Zo[ o]l.) Any spiral marine gastropod belonging to {Turritella} and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a… … The Collaborative International Dictionary of English

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