Pvn H,i I'UitlS

CARDIUM. 283
contains it. This specimen undoubtedly belongs to the
present species ;
and Mr. Dillwyn was, I believe, as care-
ful as I have endeavoured to be, in the conservation of
such proofs of authenticity. Bruguiere and Lamarck
described a tropical species as C. elongatum : otherwise
that name is more appropriate than fasciatum in respect
of our shell. The C. fasciatum of Gmelin is different,
having been derived from a figure of Knorr; but his
species is obsolete. The late Mr. G. B. Sowerby proposed
to change the name fasciatum to ovale, and Dr.
Leach to that of zonatum. It is the C. elongatum of
Turton and of most other writers on British concho-
logy, C. exiguum of Macgillivray, and (in a younger
state) probably C. scabrum of Philippi. It is also the
C. rubrum and C. arcuatum of Reeve, who by his refer-
ences to Montagu appears to have considered the pre-
sent species identical with. Lascea rubra and Loripes
divaricatus. His descriptions and figures were taken
from shells in Mr. Cuming's collection.
7. C. nodo'sum *, Turton.
C. nodosum, Turt. Conch. Dith. p. 186, tab. 13. f. 8 ; F. & H. ii. p. 22,
pi.
xxxii. f. 7.
Body subglobose, of a whitish colour, and semitransparent :
mantle edged with white pointed filaments, which correspond
with the ribs of the shell : tubes very short, pale yellow, each
having 10 or 12 flake-white cirri at the orifice, and red points
at the base, besides longer and curved white filaments above,
below, and on the sides of both tubes ;
a retractile valve :
protrudes
from the excurrent tube
not half
gills semioval, the upper
the length or breadth of the lower ones : palps very small
and triangular, pectinated more strongly above than below,
like the :
gills foot white, moderately long, sub cylindrical, with
a slight bend or elbow.
Shell obtusely triangular, convex, gibbous near the beaks,
* Covered with knots.