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Mellita quinquiesperforata
I find often these organisms washed on the beach, they are alive, they move.
On the beach.
Thank you AshleyTfor the hint. Thank you Jared Hersch for the ID, the link and the info.
Some Info: The term sand dollar (or sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida
Maybe you can get it down to genus with this:
http://en.wikipedia.org/wiki/Sand_dollar...
Nice find! I have never seen an alive one