79 



Shell subcordiform or oval, more transverse than 



longitudinal. 



Cardila sulcata Cardita intermedia 



ajar trapezia 



turgida bicolor 



squamosa depressa. 



Shell more longitudinal than transverse. 

 Cardita phrenetica Cardita concamerata 



crassicosta 



rufescens 



smuata 



aviculina 



ealyculata 



citrina 



subaspera 



sublaevigata 



nodulosa 



corbularis 



Cardita lithophagella. 

 [There are also four fossil species.] 



CYPRICARDIA. 



CHAM A CORALtilOPHAGA. Gmelin. 



! 



Chem. 10, plate 359, tab. \TZ,fig. 1673, 1674. 

 This genus lias also been separated from the Chamse 

 by La Marck : it nearly approximates the preceding 

 genus in general form, but may be easily distinguish- 



