Pvn H,i I'UitlS

294 CARDIID.E.
It is the C. Suediense of Reeve, C. Loveni of Thompson,
and C. Suecicum of Loven.
B. Shell longitudinally oblong ; ribs slight and smooth, absent
at the sides.
10. C. Norve'gicum *, Spengler.
C. Norvegicum, Spengl. Skrivt. Naturh. Selsk. v. pt. 1. p. 42; F. & H. ii.
p. 35, pi. xxxi. f. 1,2, and (animal) pi. N. f. 1.
Body nearly oval, thick, yellowish-white : mantle flesh-
colour or reddish-white ; edges plain and white : tubes short,
united at their base and divergent at the point of separation,
pale yellow, marked with flake-white spots and lines ;
the in-
current tube is rather the shorter of the two, but wider, and it
has its orifice encircled by about 20 yellowish-white cirri of
different lengths, each having a dull red-brown line round its
base ; the excurrent tube has a plain orifice, with the usual
retractile valve, which is marked on the upper and lower
surface with a faint red -brown line, a few spots of the same
colour surrounding the orifice of this tube ; the sides of both
tubes and the posterior side of the animal are clothed with
thick-set pale reddish-brown and light-yellow curled filaments
: gilh suboval, pale brown, with the edges of a deeper
hue, unequal-sized (as in the other species) but hanging more
vertically : palps very long, triangular, more deeply striated
on the outside than within : foot long and powerful, cylindrical,
geniculate, pointed at the extremity, covered (except at
the point) with a thin fleshcolour film, resembling shagreen
in appearance, under which it is pure white. The colour of
the different parts of the body varies in intensity and its rela-
tive hues, according to the age
nature of the sea-bottom.
of the individual and the
Shell longitudinally oval, with a triangular outline, moderately
convex, sloping gradually towards the front and sides in
a wedge-like form, slightly gaping at the posterior side, solid
and opaque, silky but not shining : sculpture, 40-42 extremely
faint ribs, which are quite flat and about as broad as the
intermediate spaces ; there are no ribs on the sides ; the whole
surface is crossed by remarkably crowded wavy strise, not per-
* Norwegian,