32 CHAMA. HEART-COCKLE. 



8. Carclium medium. Marbled Cockle. 



Lister, pi. 316. f. 153 Donovan, pi. 32. f. IWood, 

 pi. 50. f. 3tFalker, f. 83, 84. 



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 chesniit 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. in. 



9. Cardium fasciatum, Banded Cockle. 



Montagu, $.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 the 

 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 nigged and 

 gibbous, with the teeth obliquely locking into the 

 opposite valves. 



1. Chama Cor. Ox-heart Cockle. Fig. 17- 



Lister, pi. 275. f. 1 1 1 Donovan, pi. 134 Laskey, pi. 8. 



f. 7- 



Shell nearly globular, a little produced and fiexuous on 

 the anterior side, heart-shaped, strong, thick, covered with 

 a yellowish-brown skin, under which it is whitish or pale 

 ferruginous, with sometimes a few brovynish 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 as to" 

 form a single flat volution,, and inclining outwards, very re- 

 mote. 



