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Description Egg case of Port Jackson shark. Egg case found on Vincentia beach, Jervis Bay Territory, Australia.

Egg cases when found washed up on the beach are sometimes known as a Mermaid's purse.

The screw-like helical flanges help the mother shark to secure the egg within rock crevices.
Author User Golden Wattle on en.wikipedia
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Public domain This work has been released into the public domain by its author, AYArktos. This applies worldwide.
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