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Actinia equina
In a small hole that contained seawater
Neat, this is a sea anemone, and more than likely it's the beadlet anemone, though it's hard to tell for sure since it's retracted quite a bit! But there are only two other reddish anemones that I can think of that live on the coasts of Ireland and Britain, and they definitely don't look like this one :) So I would say it's a beadlet anemone!