1A marine mollusc with a shell that forms loose irregular coils, giving it a worm-like appearance.
- Family Vermetidae, class Gastropoda: Vermetus and other genera, including the European giant worm shell (V. gigas)
- It is a bar of worm shells at the mouth of the Mee Klong River.
- The vermetid worm shells have irregularly coiled or contorted shells which are attached to hard surfaces by their early whorls.
- The bench consists of calcareous algae and worm shells which cover the limestone and make it resistant to the wave action.
2The twisted calcareous tube of a sedentary marine bristle worm, typically attached to a stone or mollusc shell.
- The worms belong to Serpula and other genera, class Polychaeta
- Most of them were covered with these tube worm shells.
- However, almost any sort of hollow object can make a home for a hermit crab; some of them will move into straight worm shells.
- As they grow, the shells may coil or meander over the substrate producing a tube that looks quite similar to a serpulid tube worm shell.
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