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This is the distinctively striped multicolored shell of a young sea snail (about 1 cm long). These marine snails can reach an inch in length. It grazes upon algal film. The watertight operculum seals moisture within its shell, enabling it to survive for extended periods.
Found this one in a rocky Pacific tide pool. Generally, the dotted periwinkle is abundant in the high intertidal zone. They originate from Madagascar.
Credit to PN user, fishpicshi, who supplied some of the species information under description and habitat!