CARDIUM. 



PLATE III. 



cordifori 



Species 15. (Fig. a- f. Mus. Cuming.) 



Variety a. Fig. d and e. 

 Variety ,i. Fig. c. 

 Variety y. Fig. a. 

 Variety 8. Fig. /, and/ 



Cardium cardissa. Card, testa lateralis 



lati riius planissimo-compressis, utroque convexis, antico 

 interdum, autem raro, concavo ; radiatim excidptd, la- 

 tere antico liris plants subobsoletis, eequalibus, tequidis- 

 tantibus, postico lineis minutis elevatis; valvis in medio 

 acutissime elato-carinatis, carina nunc aspero-muricatd, 

 nunc obtuso-leBvigati ' 

 leviter crenulatis, i 

 cante, stramineo pt 

 films minutis pleru 

 mento parvo. 



The little-heart Cockle. Shell laterally heart-shaped, 

 sidi^ wn flatlj compressed, both sides convex, the 

 anterior sometimes but very rarely concave ; radiatelj 

 sculptured, the anterior side with equal, equidistant, 

 flat, rather obsolete ridges, the posterior with minute 

 raised lines; valves very sharply elevately keeled in 

 the middle, keel sometimes sharp-prickled, sometimes 

 obtusel) smooth, margins of the valves simple, slightly 

 crenulated, interlocking; transparent white, faintly 

 tinged with straw colour, the poster 

 atiug lines generally searlet-red ; liga 



Linn.eus, Syst. Nat., p. L121. 

 Testa latere antico concavo. 

 Shell with the anterior side concave. 

 I 'ardium monstrosum, Chemnitz. 

 Cardium inversum, Lamarck. 



Variety 0. (Fig. lor.) 



Testa stramineo viaide undato-variegata. 



Shell undulateb, variegated with bright straw cole 



■ minute radi- 

 an 1 small. 



Variety o. (Fig. 15 J and/. 



Testa latere antico omnino roseo-tincto. 



Shell with the anterior side stained all over with rose 



Cardium roseum, Chemnitz. 



Cardium Junonue var., Lamarck. 

 Eab. La-tern Seas. 



The remarkable laterally compressed growth of this 

 species renders it one of extremely interesting character; 

 and the changes of colour and style of painting which it 

 exhibits ari' numerous and characteristic, 'the typical dif- 

 ferences of form and colour were regarded both by Chem- 

 nitz and Lamarck of sufficient importance to characterize 

 distinct species, I am inclined to agree, however, with 

 Bruguiere that no specific difference can be established, an 

 opinion abundantly confirmed by the late numerous arrival 

 of specimens from China, and various islands in the Eastern 

 Hemisphere. 



Species 16. (Mus. Cuming.) 



Cardium kusticum. Card, testa suicordatd, gibbosd, la- 

 tere postico subangulato, radiatim costatd, costis ml 



nn-iiix, riilinidiitix, intrrxtitili jimi/inri/i r rris/iu/u-ni- 

 ,/nsi.s ; J'i'li-ii-,ilii'i,-ii,ili-, j)i\riis fi rrugineo-ftticis latius- 

 culis transversis ornatd. 

 Tin; in stic Cockle. Shell somewhat heart-shaped, gib- 

 bous, posterior side slightly angulated, radialely rib- 

 bed, ribs about twenty in number, rounded, inter- 

 stices peculiarly crisply wrinkled; fulvous white, 

 ornamented with rather broad rusty-brow n transverse 



Linn ei s, Syst. Nat., p. 1 I .' I . 



Hob. Adriatic and other Sea- of Southern Europe. 



Varieties ef the common Cardium edule appear to have 



been eont'c led bj several authors with this species'. The 



riehh painted specimen lure represented answers with re- 

 markable accuracj to Linnau-' description of his Cardium 

 rusticum, which nun he ea-ih distinguished l>\ the ei us 



crisped wrinkled sculpture in the interstices between the 

 ribs. 



