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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valve is an anatomical term applied to the shell of mollusks. Although in theory any mollusk shell can be termed a "valve", the word is now most commonly applied to members of two classes of mollusks: the Bivalvia (clams) and the Polyplacophora (chitons), in other words, to those mollusks whose shells are normally composed of more than one articulating part, each one of which is known as a valve (and also, in the case of chitons, as a "plate".) Species within one family of very unusual small sea snails, marine opisthobranch gastropods in the family Juliidae, also have two articulating shells or valves which resemble those of a bivalve.