Help with ID

[darnocobra]

I was wondering if anyone might be able to help me identify this:

I currently have 2 of these that have appeared in the sand. Here it is in black and white to help give an idea of the shape.

Any ideas?

 

[hollback]

Really hard to tell but I would guess a sponge.

 

[darnocobra]

Indeed it is. It is a "pineapple sponge" Thank you.