Is this just another snail?

I noticed this on my glass a few days ago, tried to get a decent pic. Is this a snail of some sort or something else? Looks like a snail that got run over...... It was less than an inch!
 
That would be a chiton..... nice critters, a little hard on coraline algae but good to have in your system.
 
I found one of those in my tank a few nights ago as well. Not sure where it came from, but they are good guys.
 
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