A "Mermaids Purse". The eggcase of a Lesser-spotted dogfish (Scyliorhinus canicula) - one of the smallest shark species found in Irish waters.
County Clare, Ireland.

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Netted Dogwhelk (Tritia reticulata) egg cases. You can see lots of tiny tiny juveniles developing inside the clear cases.
County Clare, Ireland.

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An empty egg case (mermaids purse) from a Lesser spotted dogfish (Scyliorhinus canicula) attached to the seaweed with its entangling tendrils.
County Clare, Ireland.

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A Thornback Ray (Raja clavata) egg case surrounded by Sea Potato (Echinocardium cordatum) shells. County Clare, Ireland.

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