24 CARDIADiE. 



the usual tubular valve. The foot is white, moderately 

 long, and finger-shaped, with a slight bend or elbow. 

 There are a pair of subsemieircular branchiae on each side, 

 strongly pectinated on the upper, and less so on the under, 

 surfaces. The upper branchioe are very small, not half the 

 length and depth of the under ones. Two very small tri- 

 angular palpi on each side, pectinated in a similar manner 

 with the branchiae."" — Clark MSS. 



This little cockle is chiefly an inhabitant of the lami- 

 narian zone, though it ranges far into the coralline oc- 

 casionally. It frequents weedy and gravelly bottoms, and 

 can scarcely be regarded as a common species. On the 

 south coast it occurs at Weymouth (S. H.) ; in fifteen 

 fathoms, off Portland (M'Andrew and E. F.) ; Exmouth 

 (Clark) ; Torbay (S. H.) ; Falmouth and Fowey (Alder). 

 Mr. Bean finds it at Scarborough, and Mr. Alder in North- 

 umberland. In Scotland it is frequent in the Hebrides 

 (Jeffreys and Barlee) ; Stornoway, four fathoms, sand, 

 and Zetland as deep as eighty fathoms (M'Andrew). It 

 is one of the species found by Captain Beechey in the 

 ravine more than one hundred fathoms deep, between Ire- 

 land and the Mull of Galloway. It is common among 

 weed, in from three to ten fathoms, in Clew Bay, and 

 similar localities on the west coast of Ireland ; and Mr. 

 Thompson notes it as inhabiting both sides, "generally 

 in deeper water than Cardium pT/gmceumr Bantry Bay 

 (Humphreys). 



It ranges from the shores of Norway to the Mediter- 

 ranean. 



