,
\
*1c
'
'
\
|
|
At
the soft depthS level of Algiers bay, five populations
have
been showed off
:
-
—
the
ophiura textura — Donax semistfiatus population of fine sands'Ï
existing in the infralittoral zone only.
'
_
'
\
—
the muddy fine sands LumbfineriSimpatiens'—‘—Tèllina distorta
wioh
occurs
in
the
infralittoral zone ranging from — 15 to — 25 m
|
depth.
The
population may go more down the circalittoral zone in
_
fine dècantation zones.
'
'
,
—
the Chàetozone setosa — TharXX'marioni population of sandy mud
_
sd®céeding to the previous one lying down to — 55
It
is
between the infralittoral and oircalittoral zones.
_
'
l
—
the_Apseudes sp — Sternaspis soutàta population of pure mud lo—
t
oated
into
the oiroalittoral zone only.
'
\
—
At
last,
the Amphiura Chiajeî population of muddy gravels pre—
(
sent
in both ciroalittoral and infralittoral zones.
_
.
_
_
.
,
,
[
4
.
_
1
l
\