It does look quite a bit like a chiton. Give it a poke and a pry, see if it is hard and difficult to get off the rock (don't try too hard, you don't want to tear it). They're a type of plated mollusc. As noted, most species are herbivores, although a few are carnivorous.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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