The coiled casings of a type of marine polychaete worm called a Spiral tubeworm (Spirorbis spirorbis) left empty on substrate that has been washed above the high tide line - often seaweed but in this case a piece of shale. County Clare, Ireland.

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A small Sea Gherkin (Pawsonia saxicola) on a bed of Spiral tubeworms (Spirorbis spirorbis) with a photo bombing Scale worm (Polynoidae sp.) in the bottom right hand corner.
County Clare, Ireland.

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