30 
CARDIUM. COCKLE. 
and longitudinally lance-shaped, like the upper ones of the 
full grown shell. 
Variety. With the spines somewhat spatulate or flat¬ 
tened, and rather longer and more distant. We have in our 
cabinet specimens, where some of the spines are lanceolate, 
some of them pointed and curved, and others spatulate, 
thick, and very obtuse. 
Cardium Spatula. Laskey, Went . Soc. p. 381. 
Common on most sandy coasts, v. v. 
4. Cardium edule. Common Cockle. 
Lister, 334. f. 171— Pennant , pi. 53. f. 3— La Costa } pi 11. 
f. 1— Dorset Cat. pi. 11. f. 1— Donovan , pi. 124— fFcod, 
pi. 55. f. 4. 
Shell convex, a little produced on one side, with about 
twenty-six ribs, which are flattened in the middle and a 
little rounded at the sides, mostly marked with concentric 
rings and ridges, and somewhat roughened near the cir¬ 
cumference with obsolete recurved, scales, which are 
stronger on the shorter side : color white or yellowish- 
white with often a blueish cast, generally dark red at the 
elongated end and towards the hinge; inside white, with a 
large dark red blotch on the produced side. The very young 
are globular, semitransparent, and clear white. Length 
about an inch and a half; breadth a little more. 
Variety A. Cardium rusticum. Lister , pi. 329. f. 166. 
Donovan , pi. 124. f. 2. Wood, pi. 55. f. 2, 3. 
Shell larger, with about eighteen or twenty ribs, which 
are more elevated and rugged in the interstices, of a fer¬ 
ruginous or livid color, with often narrow chocolate- 
brown zones. 
Variety!^. Very much elongated and flattened on oneside. 
Variety C. Globular, with all the ribs rounded, rather 
polished, of a pale reddish white, with a rose-colored 
tinge about the projection below the hinge on the pcste- 
rier side, and about half the size. 
These two last are found imbedded in blue day at the 
mouths of rivers, in Dublin b^iy : but all the varieties may 
be distinguished by the obseui^e transverse scales. 
Common on all coasts, v. v. 
5. Car- 
