32 CHAMA. HEART-COCKLE. 
8 . Cardium medium. Marbled Cockle. 
Lister, pi." 316. f. 153— Donovan, pi. 32. f. 1 —Wood. 
pi. 50. f. 3— lFather, 
Shell somewhat triangular and heart-shaped, a little ab¬ 
rupt on one side, and running into an angle at the front 
margin, the other side shorter and rounded, with from 
thirty-six to forty smooth ribs : color white; the inside 
with mostly a ferruginous or cheshut hue about the ab¬ 
rupt side : teeth one in each valve, and together with the 
lateral ones strong and prominent; the margin notched: 
length about an inch ; breadth the same. 
On the coast of Durham!: very rare. v. m. 
' 9.' Cardium fasciatum. Banded Cockle. 
Montagu, pl.27-.f- 6. 
Shell nearly orbicular, semitransparent, with about 
twenty-seven smooth glossy flattened ribs, slightly tuber- 
cled at the shorter side, and sometimes round the margin: 
color rufous white, with three or four darker transverse 
bands, more strongly marked at the longer end and on tie 
inside, where the ribs are also obvious : length hardly three- 
eighths of an inch ; breadth rather more. 
Sandy coasts of England, Ireland, and Scotland, v. v. 
CHAMA. HEART-COCKLE. 
Shell with two strong valves : hinge ruggedand 
gibbous, with the teeth obliquely locking into the 
opposite valves. 
1. Chama Cor. Ox-heart Cockle. Fig. 17- 
Lister, pi. 2/5. f. 111— Donovan, pi. 134— Laskey, pU, 
f* / - 
Shell nearly globular, a little produced and flexuousoc 
the anterior side, heart-shaped, strong, thick, coveredwifi 
a yellowish-brown skin, under which it is whitish or pah 
ferruginous, with sometimes a few brownish blotches, very 
finely striate transversely with several coarser ridges; the 
cartilage prominent and rounded : beaks large, prominent, 
much curved inwards towards the posterior slope so ash 
fprm a single flat volution^ and inclining outwards, veryre? 
