dicuscontbet: beaded valentine jewelry

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The term seashell usually refers to the exoskeleton of an invertebrate (an animal without a backbone). Most shells that are found on beaches are the shells of marine mollusks ("molluscs" in British English), partly because many of these shells endure better than other seashells.

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Valentine's Day Craft Jewelry:
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Inspired Valentines "Para
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Earthy Lampwork Bead and
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Fuse Bead Valentine Heart
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Jewelry Styles
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Apart from mollusk shells, other shells that can be found on beaches are those of barnacles, horseshoe crabs and brachiopods. Marine annelid worms in the family Serpulidae create shells made of calcareous tubes cemented onto other surfaces. The shells of sea urchins are called tests, and the moulted shells of crabs and lobsters are called exuviae. While most seashells are external, some cephalopods have internal shells.