Pictures show a Cryptoplax Larvaeformis (Chiton), a harmless herbivore. We found this creature just the other night. Very cool little animal. We welcome him into our collection.....now that we know he is good to have. Thought this might be interesting if you have never seen one before. (we never have)
reference for identifcation:
http://www.chucksaddiction.com/Hitchsnails.html