from
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]