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Webster's 1913 Dictionary
PECTOSTRACA
Pec
*
tos
"tra *
ca,
n.
pl.
Etym:
[
NL.
,
fr.
Gr.
(Zoöl.)
Defn: A
degenerate
order
of
Crustacea,
including
the
Rhizocephala
and
Cirripedia.