77 



Cardium pseudolima 



aculeatum 



erinaceum 



tuberculatum 



• • isocardia 



muricatum 



angulatum 



marmoreum 



elongatum 



ventricosum 



rugosum 



sulcatum 



serratum 



Cardium laevigatum 



• • biradiatum 



eolicum 



pectinatum 



rusticum 



edule 



Groenlandicum 



latum 



crenulatum 



exiguum 



minutum 



roseum 



scobinatum. 



Umbones carinated or angular, the posterior side often 

 much larger than the anterior. 



Cardium unedo 



medium 



• • • fragum 



retusum 



• tumoriferum 



Cardium hemicardium 



• •• cardissa 



inversum 



........ Junoniae 



•• • lineatum. 



[There are also fourteen fossil species.] 



