Last Updated：2022/12/24
If the preoral (Hatschek's) pit be regarded as a gland, it has been suggested by v. Wijhe that it is comparable to the neural gland of the Tunicata, and that the ciliated groove is comparable to the opening of that gland, the dorsal tubercle, the edges of which are frequently drawn out in a manner very similar to the course of the ciliated groove of Amphioxus.
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If
the
preoral
(Hatschek's)
pit
be
regarded
as
a
gland,
it
has
been
suggested
by
v.
Wijhe
that
it
is
comparable
to
the
neural
gland
of
the
Tunicata,
and
that
the
ciliated
groove
is
comparable
to
the
opening
of
that
gland,
the
dorsal
tubercle,
the
edges
of
which
are
frequently
drawn
out
in
a
manner
very
similar
to
the
course
of
the
ciliated
groove
of
Amphioxus.
