Pvn H,i I'UitlS

venus, 333
rior side elongated, and somewhat wedge-shaped
but likewise
rounded ; no decided angularity is shown in any part of the
contour : beaks nearly contiguous, recurved ; the umbonal part
of the shell is rather protuberant : hinule lance-shaped, defined
by a distinct furrow, of a deeper colour in immature
with shelv-
specimens ; lips slightly prominent : corselet deep,
ing sides : ligament rather long, thick and strong, homcolour,
projecting beyond the corselet: hinge-line rounded: hingeplate
thick, broad, and flexuous : teeth, in the right valve three
cardinals, that on the anterior side being blunt, and placed
obliquely, or nearly at a right angle to the other two, which
diverge, like an inverted V; in the left valve are three cardinals,
of which the posterior is long, laminar, and nearly parallel
with the hinge-line, and the other two are short, close together,
and triangular this valve has also on the anterior side a
;
pair of small teeth placed nearly at a right angle to the middle
pair, and, with the side tooth in the right valve, probably re-
the posterior lateral in each
presenting anterior lateral teeth ;
valve is long and : ridge-like inside chalky-white, except the
scars, which are glossy, large and conspicuous, the pallial scar
thickened. L. 2-75. B.3.
exhibiting a prismatic lustre ; margin
Habitat :
Southern and western coasts of England,
of from 12 to 25 fathoms. It is
in sand, at depths
common on the Cornish trawling-grounds.
Mr. Lyons
told me that he had found it at Milford Haven; Mr.
M fAndrew has taken it in Carnarvon Bay; and Mr.
Walpole obtained a single valve by dredging off Dalkey
in Dublin Bay. It has not been noticed on any part of
our northern coasts ; and although Sir Cuthbert Sharp
included it in a list of shells from the neighbourhood of
Hartlepool, published in his history of that place, Mr.
Alder has given satisfactory reasons for believing that
it was mistaken for Cyprina Islandica. It is not rare
in the Coralline Crag. Not one of the Scandinavian
naturalists has mentioned it; but its range south of
Great Britain extends from La Manche (De Gerville)
to the Lusitanian coast (M'Andrew) and every part of
the Mediterranean, and also to the iEgean (Forbes) and