218 CARDIUM. 



GREENISH COCKLE. 



16^ Cardium glaucum. C. testa cordata, subantiquata, antice glauca, 

 costis viginti, postice retrorsum imbricatis, natibus violaceis. Poiret 

 Voy. in Barbar. 2. p. 13. Linn. Gmel. p. 3253. Brug. Encyc. Meth. 

 Hist. Nat. 6. p. 221. 



Shell heart-shaped, somewhat worn, greenish before ; ribs twenty, with 

 imbricated scales turned backwards ; umbones violet. 



This is a small, heart-shaped shell, less than an inch 

 in length, with twenty, or twenty-one, convex, longitudi- 

 nal ribs ; it is white, except the anterior part, which is 

 greenish, and the tips, which are violet ; the inside is 

 brown before, and violet at the hinge; the posterior 

 edges are white. 



This is a very common species in the Mediterranean, 

 particularly on the coasts of Languedoc, where it is so 

 common, that Bruguiere is astonished it has escaped 

 detection. It agrees with the C. virgineum of Linnaeus, 

 in every thing except in the longitudinal ribs, which are 

 wanting in the Linnaean shell. Poiret found it on the 

 coast of Algiers. 



MOTTLED COCKLE. 

 PI. 52. /. 3. Mrs. Ma we. 



17. Cardium maculosum. C. testa ovata, subcordata, maculis brunneis 



insignita ; costis 48. 

 Shell oval, somewhat heart-shaped, and speckled with brown ; ribs 



forty-eight. 

 Encyclop. Method, pi. 298. f. 6. 



This shell is of an oval shape, and of a white colour, 

 mottled with brown, or tawny ; it has forty-eight deli- 



