can you tell me what this is?

Images: 

we have seen a lot of these on our beaches here in South Carolina and I've looked everywhere to find out what they are with no luck

Wild guesses

It's a pretty cool creature, whatever it turns out to be.  I at first thought it might be some kind of cowry like the Coffee Bean Trivia, but I found some live photos on line and they didn't look the same.  

I also wondered if it could be something like these corals just described by Anna DeLoach in the Pacific that have a symbiotic worm that pulls them around:  http://blennywatcher.com/2012/04/28/walking-coral/

I will watch with interest to see if someone comes up with an answer.

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