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Our
classifications
are
often
plainly
influenced
by
chains
of
affinities.
Nothing
can
be
easier
than
to
define
a
number
of
characters
common
to
all
birds;
but
with
crustaceans,
any
such
definition
has
hitherto
been
found
impossible.
There
are
crustaceans
at
the
opposite
ends
of
the
series,
which
have
hardly
a
character
in
common;
yet
the
species
at
both
ends,
from
being
plainly
allied
to
others,
and
these
to
others,
and
so
onwards,
can
be
recognised
as
unequivocally
belonging
to
this,
and
to
no
other
class
of
the
Articulata.
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