CARDIUM. COCKLE . 
29 
rounded, very rugged with tubercular wrinkles : color 
yellowish-brown, with often pale and chocolate-brown bands 
and markings, generally of a deep cliocolate-brown about 
the margin and anterior side, and of a milky whiteness 
about the posterior protuberance : beaks very prominent 
and nearly central; inside glossy, with a fawn-color or 
fleshy tinge 5 the grooves on the inside reaching only about 
half way up the shell: diameter sometimes above three 
inches. 
It is much larger than C. echinatum, and so ponderous 
that one of them will outweigh three of the latter of the 
same size; the tubercles are never produced into spines, 
mid the anterior slope, when viewed in front, is remarkably 
flattened and regularly ribbed, in which state it is repre¬ 
sented in our figure, v. v. 
Cardium nodosum. Montagu, p. 81. The young shell. 
Shell flatter than the young of C. echinatum, more re¬ 
gularly orbicular, of a reddish colour, with often darker 
bauds; the tubercles are closer and more obtuse ; the ribs 
arc more rounded; and it is thicker and stronger. We have 
this species in all its gradations of size, and can therefore 
have no hesitation in combining them together. 
On the South Devon coast, v. i\ 
• 3. Cardium echinatum. Thorny Cookie. 
. Lister, pi. 32d. f. 161— Da Costa , pi. 14. f. 2— Donovan, 
pi. 10/.f. I—Dorset Cat. pi. 6 . f. 2— TFood , pi. 4.9. f. 1, 2. 
Shell very convex, a little produced but not flattened on 
the cartilage side, rounded on the other, with from eighteen 
to twenty ribs clothed with sharp white enamelled spines, 
which when viewed sideways resemble fine teeth ; these 
3 re often much curved towards the produced side, while 
those near the hinge are of a longitudinally lance-shaped 
form: color dull rusty brown more or less mixed with 
white, with often deeper belts ; inside, glossy white : duir 
meter about two inches and a half. 
1 Cardiumciliare. Pennard, pi. 53. f. 2 — Donovan , pi. 32, 
f. 2—Dorset Cat, pi, 4. f, l— Wood\ pi. 49* f* 3, 4* The 
young shell. *■ 
Shell nearly globular, not produced on the cartilage side, 
wliite, very thin and transparent, wit)] the spines ajl llat 
p 3 mi 
