Pvn H,i I'UitlS

LORIPES. 235
to have placed them in different genera, one in Lucina
as L.lactea, and the other in Amphidesma as A. lucinalis.
B. Shell marked by flexuous striae ; lateral teeth distinct.
2. L. divarica'tus * } Linne.
Tellina divaricata, Linn. Syst. Nat. p. 1120. Lucina divaricata, F. k H.
ii. p. 52, pi.
xxxv. f. 3.
Shell resembling that of L. lacteus in shape, bnt more
tumid and having an oblique outline, thick and opaque, rather
glossy : sculpture, numerous imbricated and flexuous striae,
which bend from the middle of the shell to each side with a
gentle curve, the highest point or centre of the curve being in
the direction of the beak the striae are ;
irregularly concentric
in the umbonal area, and become flexuous in the subsequent
stage of growth the surface is also marked ; by minute closeset
longitudinal striae or lines as in the last : species colour
white with a slight tinge of : yellow epidermis so thin as to
be scarcely visible : margins rounded on all sides, except where
the beak projects ; the posterior is the highest and forms a
kind of shoulder : beaks very prominent, gibbous, close toge-
ther, and twisted towards the anterior side : lunide deep,
heart-shaped, and defined on each side by a strong ridge :
hinge-line curved, occupying not quite
one-fourth of the cir-
cumference : cartilage light horncolour, narrower than in L.
lacteus, but similar in shape and position : hinge-plate rather
broad and strong : teeth, in the right valve one strong blunt
cardinal, and a long, sharp and raised lateral on each side ; in
the left valve two cardinals, one of which is strong and blunt,
and the other very much smaller and on a lower level, besides
two laminar laterals on each side, receiving between them the
single lateral on the corresponding side of the other valve ;
the posterior laterals are the : longest inside slightly nacreous
but of a dull hue ; margin finely crenulated : scars large and
distinct, that left by the anterior adductor muscle being not
much longer 1 X & than the other. L. 04. B. 0-4.
Habitat :
Sonth coast of England, but exceedingly
* Spread out, with reference to the different directions exhibited by
the markings on the shell.