238 CARDIUM. 



RUSTY COCKLE. 



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



vexis t 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 incequilatera, 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 incequilatera, oblonga, costis subtilibus, 

 supra duplkatis. 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. 



