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Arca tetragona - Ark shell

Arca tetragona - © Sarah Longrigg

We had spent all day on the beach at Kildonnan on the Isle of Eigg.
Fred said it was time to go, so I asked for one more minute to find the really special shell I'd been hoping for all day.
During that minute I found this Arca tetragona - the first I had ever found.
It measures about 3 cm in width. The picture shows the interior of the shell