40
ANATINID^.
front, with a slight indentation towards the posterior side,
which is more or less obliquely truncated, and separated by a
blunt angular ridge in each valve, with an obscure intermediate
fold, making this side aj^pear bicarinated; dorsal margins
gently curved : healcs very prominent, obliquely inflected to
the posterior side ; the space below them on each side is deeply
excavated : ligament short and cylindrical, greyish- horncolour,
separating the valves by an elliptical gajD : cartilage yellowish,
contained in a narrow but solid receptacle, which lies parallel
with the hinge-line, and does not project far within the shell;
the receptacle is supported underneath by the ordinary rib-like
process : hinge-line obtusely angular : hinge-plate narrow and
slight : ossicle as in the other species : inside yellowish ; edges
blunt : scars nearly marginal. L. 2. B. 2*5.
Habitat : 4-70 f. in suitable parts of the English,
Irish, Scotch, and Shetland coasts ; difficult to procure
on account of its habit of burrowing rather deeply in
muddy sand. Not uncommon in the " alluvial" deposit
at Belfast (Hyndman and Grainger) ; Wexford (Sir
Henry James) ; Coralline Crag (S. Wood) ; " glacial
'''
formation near Drontlieim, 400-500 feet above the
present sea-level (Sars) ; Palermo (Philippi) . It has
been noticed as a Swedish and Norwegian species by
Loven, Sars, M*^Andrew and Barrett, Danielssen, and
Malm, at various depths between 8 and 100 f
.
M^Andrew dredged it off Gibraltar in 45 f. ; and Martin
obtained it from fishermen on the coast of Provence,
but smaller in size than northern examples.
This handsome shell may easily be recognized by its
almost globular form. The young and fry corresjoond
in shape with the adult; but they are wdiite and not
so convex, and their dorsal margins are quite straight.
The ligament, as well as the epidermis are wonderfully
preserved in fossil specimens dug out of the clay -bed at
Belfast.
Montagu described it as a large form of T, distorta.
ANATINID^.
front, with a slight indentation towards the posterior side,
which is more or less obliquely truncated, and separated by a
blunt angular ridge in each valve, with an obscure intermediate
fold, making this side aj^pear bicarinated; dorsal margins
gently curved : healcs very prominent, obliquely inflected to
the posterior side ; the space below them on each side is deeply
excavated : ligament short and cylindrical, greyish- horncolour,
separating the valves by an elliptical gajD : cartilage yellowish,
contained in a narrow but solid receptacle, which lies parallel
with the hinge-line, and does not project far within the shell;
the receptacle is supported underneath by the ordinary rib-like
process : hinge-line obtusely angular : hinge-plate narrow and
slight : ossicle as in the other species : inside yellowish ; edges
blunt : scars nearly marginal. L. 2. B. 2*5.
Habitat : 4-70 f. in suitable parts of the English,
Irish, Scotch, and Shetland coasts ; difficult to procure
on account of its habit of burrowing rather deeply in
muddy sand. Not uncommon in the " alluvial" deposit
at Belfast (Hyndman and Grainger) ; Wexford (Sir
Henry James) ; Coralline Crag (S. Wood) ; " glacial
'''
formation near Drontlieim, 400-500 feet above the
present sea-level (Sars) ; Palermo (Philippi) . It has
been noticed as a Swedish and Norwegian species by
Loven, Sars, M*^Andrew and Barrett, Danielssen, and
Malm, at various depths between 8 and 100 f
.
M^Andrew dredged it off Gibraltar in 45 f. ; and Martin
obtained it from fishermen on the coast of Provence,
but smaller in size than northern examples.
This handsome shell may easily be recognized by its
almost globular form. The young and fry corresjoond
in shape with the adult; but they are wdiite and not
so convex, and their dorsal margins are quite straight.
The ligament, as well as the epidermis are wonderfully
preserved in fossil specimens dug out of the clay -bed at
Belfast.
Montagu described it as a large form of T, distorta.