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The Collaborative International Dictionary of English v.0.48:

Isopleura \I`so*pleu"ra\, n. pl. [NL. See Iso-, and Pleura.] (Zool.) A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal. [1913 Webster] Note: The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons (Polyplacophora), together with Neomenia and Ch[ae]toderma, which are wormlike forms without a shell. [1913 Webster]