At first I would like to apologize for eventual English error of language (French woman inside!).

I am in Greece (Corinthia gulf precisely) and I found a strange thing that none of us could identify (jelly fish? Eggs of fish ? ...)

We saw a dozen of these grouped on line, moved by the sea, and some of them gone on the beach. We could touch them without being hurted. The up side was solid and transparent, and inside there was a red / brown round part and a clear one that made a spiral. The bottom was transparent, without tentacles and more soft, like jelly ...

Could you tell me what was this?

Thank you for your help on this interrogation!

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Sorry no one seems to know the answer to your question.