what do you think this is??

I can't quite make out the subject in your image.., however, from your description it sounds like a bivalve/clam/oyster to me.
 
ok cool...today all of the little cracks were wide open...in the pic it actually looks like a cracked piece of rock..thanks for the replies tho
 
I've got something a bit like that (except yellowish) that is a sponge. However, if you can see it moving as you watch then I would say shellfish. Touch it and if it closes abruptly it is some sort of shellfish, otherwise I would say sponge.

Steve
 
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