All pics except the last one correspond to a type of starfish called cushion starfish (Culcita sp.). The three middle photos are the same but the part below in the starfish.
The last pic is of a sea urchin skeleton, sand dollar, I think.
I think, there are almost three species of urchins in there. It would be great if you could split it into three different spottings. That way it will be easier to identify.
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