CAEDIUM.— Plate XII. 



The shrivelled Cockle. Shell orbicular, very thin, fra- 

 gile, posterior side produced, gaping open ; radiately 

 ribbed, ribs about three or four and forty in number, 

 thin, rather superficial, nearly obsolete towards the 

 umbones ; sometimes whitish variegated with pink, 

 sometimes purple or yellowish bay, umbones pinkish 

 purple. 



( i ronovids, Zoophylacium, pi. IS. f. 5. 



Cardium apertum, Chemnitz, Lamarck, Sowerby. 

 Cardium virgineum, var. 0, Gmelin. 



Ilah. Eastern coast of the Island of Luzon, Philippines 

 (found in sandy mud at the depth of about seven fa- 

 thoms) ; ( luming. 

 This very delicate and elegant species varies singularly 



in eoloiu - , some examples being white mottled with pink, 



whilst others are of a clear orange bay or purple. 



Species 64. (Mus. Cuming.) 

 Cardium tumoriferum. Card, testa cordatd, tumidd, 



oblique quadrilateral/ ', postice compressd, carina promi- 



nence uh umbonibus ad margines decurrente; radiatim 

 costatd, costis planulatis, fere evanidis, interstitiu 



erehr'qmiietatia ; area anticd magna, Ian ■ nived. 



TnE blistered Cockle. Shell cordate, swollen, obliquelj 

 quadrilateral, posteriorly compressed, with a prominent 

 keel running down from the umbones to the margins ; 

 radiately ribbed, ribs flattened, almost obsolete, inter- 

 stices closely punctured ; anterior area large, smooth ; 

 snowy white. 



Lamarck., Anim. sans vert. (Deshayes' edit.), vol. ii. p. 

 410. 



Hah. New Holland. 



This species which I at first hesitated to consider any- 

 thing more than a variety of the Cardium iemicardium, ap- 

 pears to differ in having the anterior area perfectly smooth, 

 whilst the ribs are much less prominently developed. The 

 name given to this shell is suggested by the circumstance 

 winch Lamarck relates of its interior being often blistered, 

 and which is certainly very conspicuous in the example 

 before me. 



