238 CARDIUM. 



RUSTY COCKLE. 



44. Cardium rubiginosum. C. testa rubella, ineequilatera ; costis con- 



vexis. transversim striatis. Linn. Gmel. p. 3256. 

 Shell reddish, with unequal sides ; ribs convex, transversely striated. 

 Gualt. Test. pi. 83. f. D. 



A somewhat oval shell, very strongly ribbed, with 

 wide grooves between ; margin crenated. Length an 

 inch ; breadth an inch and a quarter. 



Country unknown. 



WHITISH COCKLE. 



45. Cardium albidum. C. testa ineequilatera, costata, subalbida, intus 

 purpurea. Linn. Gmel. p. 3256. 



Shell of unequal sides, ribbed, whitish ; inside purple. 

 Gualt. Test. pi. 83. f. H. 



A very small shell, about a quarter of an inch long, 

 with longitudinal ribs, and a serrated margin. Perhaps 

 the young of a larger shell. 



GREENISH COCKLE. 



46. Cardium virescens. C. testa ineequilatera , oblonga, costis subtilibus, 



supra duplicatis. Linn. Gmel. p. 3256. 

 Shell of unequal sides, oblong, with very fine ribs, doubled above. 

 Gualt. Test. pi. 84. f. A. 



A thin, brittle, pellucid shell, of a greenish white 

 colour, sometimes variegated with rosy spots. Inside 

 silvery. Length three quarters of an inch. 



