What are these dotted ball shaped things I circled in yellow in the image?

I thought they may be sea urchin skeletons. Though the things in the image may be too many and too large?

They are in a mural in Brighton, England. The subject is “Protecting Costa Rican Wildlife”, so I guess they are of some native species there.

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4 points

Not all urchins look like that, there’s a lot of different types

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What is this thing?

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