It’s all snugged in there. Looks like a pastry or something. It was the white spiral that jumped out at me. I didn’t disturb it to see if there was something alive in it, but usually when the stones are dry like this, there isn’t. On the other hand, it depends how far it is from the tide lines. And the tides vary considerably, and there are zillions of stones, so it’s hard to say.
Anyway, now I know why there are pastries that are called “snails!”