Ophyotrix fragilis arms and mouth tentacles of an unidentified polychaete lean out from under the spiky oyster overgrown with Spirastrella.
There are two more coronas at the top, one of them belongs, probably, to Megalomma vesiculosum.
At last, there are yellow threads of Eupolymnia nebulosa and an urchin at top left, as well as red Crambe crambe at the middle of the shell.