Land mollusks like slugs and snails move slowly by means of a flat sole called a foot. Mollusks living in the ocean move by jet propulsion. The mollusk ejects water from a cavity within their bodies shooting them forward. Some molllusks are mainly sessile and can stay glued to rocks or other surfaces for all their lives. Animals like chitton do this. If they do choose to move, it will be very minimal and will involve the foot to contract producing tiny waves of motion. The class that uses this type of motion is the class Polyplacophora.
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