What is this thing?

[honkeystyle]

While diving off Palm Beach I saw a glimmer in the sand and thought it was some trash. Upon getting closer I could see that it was by no means trash, but a blueish spiny thing with luminescent tips. I took some pics of it although with a cheap camera, and I'm less than 5 posts so I cant upload a url, but I put it in my member photo album. Nobody could tell me what it was, so I was hoping maybe someone here could.
Dan-

 

[honkeystyle]

pics...

 

[drivsea]

Am looking to see what kind of urchin that is.... closest thing in the Deloach/Humann id books is the long spined urchin, usually black spines "occasionally have some grayish white spines" .