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Save the univalve's operculum and slice it off the muscle that holds it.
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A shell pin made from the columella of a large univalve.
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There are three varieties, spiral, univalve, and bivalve.
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It was easy to see that the stones are thin and porous opercula, which have formed part of small univalve shells.
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There was one imported shell that we did not value much, it was so abundant-thefreckled univalve they called a "prop."
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Bivalve and univalve mollusca seem to be rare at the greatest depths; but starfishes, sea urchins and other echinoderms, zoophytes, sponges, and protozoa abound.
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True molluscan shells come in two main varieties: BIVALVES and UNIVALVES.
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He shows the blackish bottom half, replete with fossilized protozoa, plankton, univalves, bivalves, cephalopods, and corals.
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Univalves have only one shell, usually coiled, but sometimes shaped like a cap or miniature volcano.
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UNIVALVE'S anatomy: As before, a) foot, b) siphon, c) mantle, but also d) operculum.
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Shell beads discoidal and cylindrical in form, made chiefly from the columellæ and walls of marine univalves.
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Most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods.
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A large number of univalves belonging to the gastropods are conical, cup-shaped, or shieldlike, as the limpets.
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Univalves may have spines on their shoulders.
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Univalves include whelks, winkles, conchs.
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Most species of univalves are wanderers, many bivalves are free, and multivalves become fixed at an early stage of existence.