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Full Version: What are these? Pacific Ocean
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Hello, I find these occasionally on the beaches of southern California.  I am really not sure of what they are.  If anyone can help me solve this mystery I sure would appreciate it. thank you
They look like pieces of a bigger shell to me, but worn by the sea. I don't think they are erchins or such, but hopefully someone with more knowledge of the areas species will prove me wrong.

Best wishes,

Emma.
thank you for your response Wink  I have a whole collection of these and they all seem to have the same pattern/ridges.