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Webster's 1913 Dictionary
PROSOBRANCHIATA
Pros `o *
bran
`
chi
*a "
ta,
n.
pl.
Etym:
[
NL.
,
fr.
Gr.
(Zoöl.)
Defn:
The
highest
division,
or
subclass,
of
gastropod
mollusks,
including
those
that
have
the
gills
situated
anteriorly,
or
forward
of
the
heart,
and
the
sexes
separate.