Anyone any idea?

[davidebt]

Hi all. New to the forum as I am a snorkeller only.

While on an extended trip to Mauritius (still here) my wife found the following on the surf line on the beach while looking for shells.

It's far too perfect to be a worn down shell.

Any ideas as to what it might be would be very welcome. Is has a hard smooth surface like a cowrie.

Regards

David