Strange worm from Cozumel

Found this worm in Cozumel. It was about 1 inch in diameter and the portion not buried in the sand was about 10 inches long. As I approached it slowly rectracted back into the sand. I couldn't find it in my books. If I knew it was an oddball I would have taken other shots. What is it?

HI David,

I'm no worm expert, but it looks like a "peanut" worm to me aka Sipunculid

Cheers

James

James is right as usual. It's in the phylum Sipuncula. Looking at the texture of the skin you can see why it's called a peanut worm. I don't know of any picture guide for the Caribbean and it's not my group so I can't be of much help, sorry. Hopefully another WP member knows more & can help out with a name.