What kind of invert is this?

[illuminum]

I'll post photos of it in the next half hour. It looks like a flat rolypoly and isn't much bigger than one either. It moves really really slow.
It also has no identifiable legs, eyes or tentacles. I've never seen anything like it before. It came on a rock that my mushroom was on.

Any ideas?

 

[jpslickorocks]

chiton??

 

[illuminum]

Yep, I googled it and that's what they are. Thanks!