77 



This fpecies is very common in mofl of our inlets and 

 bays, near the mouths of rivers, where the fhore is fandy, 

 buried three or four inches under the furface ; where it is 

 taken for the table, and is vulgarly called Cockle. 



A variety is frequently found quite equilateral, not fo 

 large, and perfeftly white ; fuch has been confidered as 

 a diftin6l fpecies, but we believe without foundation. 



2. 

 Cardiura aculeatum. Lin. Syft. ^^. \\22. IS. Aculeatum. 



Gmel. Syft. p. 3247. 7. 



Chem. Conch, vi. t, 15. f. 153. 157. 



Guah. t. 72. A Br. ZooJ. t. 50. f. 37 . 



Turt. Lin. iv. p. 20 1 . — Da Cojla. p. 1 7 5. 



Don. Br. Shells, i. t.6. ^-Favan. t. 52. A. 



Lijier Conch, t. 321. f. 153 ? 

 Cardium tuberculatum. Pult. Cat. Dorjet. p. 30? 



C. with a very convex fiiell ; the anterior fide rounded, 

 the other nearly ftraight, or as it were truncated, and 

 more elongated at the front marginal angle ; ribs about 

 twenty one, with a depreffed line down the middle; ti:e 

 round end befet with large compreffed tubercles, the 

 other part towards the margin with fpines, which increafe 

 in length at the oppofite fide: colour yellowifh brown, 

 fafciatedand blotched with rufous, andfometimes blackilh. , 

 Infide glofiy purplifli, or flefli colour, with flat ribs, the 

 furrows on the outfide becoming raifed within; interflices 

 between the ribs white, 



Mr.PEM- 



