Source : Webster's Revised Unabridged Dictionary (1913)

Isopleura \I`so*pleu"ra\, n. pl. [NL. See {Iso-}, and {Pleura}.]
   (Zo["o]l.)
   A subclass of Gastropoda, in which the body is symmetrical,
   the right and left sides being equal.

   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.