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Webster's 1913 Dictionary
ARTHROSTRACA
Ar
*thros "tra *
ca,
n.
pl.
Etym:
[
NL.
,
fr.
Gr.
(Zoöl.)
Defn:
One
of
the
larger divisions
of
Crustacea,
so
called
because
the
thorax
and
abdomen
are
both
segmented;
Tetradecapoda.
It
includes
the
Amphipoda
and
Isopoda.
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