if you've never seen one of these before, and perhaps you have not, this is a LIVE sand dollar. most people only see the ones you can buy in the store, all white. this is what they look like pulled straight out of the ocean live.
i should know, we used to pick these up all the time growing up on the Gulf. today, i stepped on one while walking in the surf at Flagler Beach, FL & knew immediately what that feeling was. as many of these as i picked up as a kid, i was still amazed to find this today. i bet i haven't actually seen a live one since i was a kid! and of course i "set it free". took it back out into the surf, and buried it under water in the sand. hope it is never found again!