Any ideas on what is this animal? I found it at very low tide, under rock slabs, size about 18 cm.

odontaster penicillatus?

these were found about 50 m deep off barranquillas beach, south of caldera bay, atacama region, Chile.
not sure about the id.

Unidentified.

Hi everyone!
I wonder what this object is, it was found in a trawl off north chile in about 500 m depth.
gastropod egg collar?
any comments welcomed.