56 



CONCHOLOGY. 



C. tuberculatum. 

 C. apertuiii. 

 C. bullatum. 

 C. echinatum. 

 C. biradiatum. 

 C. pectinatum. 

 C. isocardium. 

 C. angulatum. 

 C. serratum. 

 C. medinum. 

 C. tumotiferum. 

 C. retusum. 

 C. rusticum. 

 C. Greendlandicum. 

 C. crenulatum. 

 C. minotum. 

 C. scobinatum. 

 C. cardissum. 

 C. inversum. 

 C. ventricosum. 

 C. obtusum. 



C. erinaceum. 



C. basilianum. 



C. papyraceum. 



C. ciliare. 



C. levigatum. 



C. eolicum. 



C. elongatum. 



C. lugosum. 



C. unedo. 



C. fragum. 

 C. lineatum. 

 C. edule. 

 C. latum. 

 C. exigunum. 

 C. rosenum. 

 C. hemicardium. 

 C. junoniae. 

 C. muricatum. 

 C. marmoreum. 

 C. sulcatum. 

 C. cifidium. 



3. Genus Cardita. 

 Animal. Body suborbicular, terminated superiorly by a sort 

 of hook ; mantle but little open ; foot terminated at its extremity 

 by a part much narrower than the base ; superior lobes of the 

 branchiae very short. 



Shell. Thick, solid, equivalve, more or less inequilateral ; sum- 

 mit dorsal, always much flexed anteriorly ; hinge similar, formed 

 by two oblique teeth, one short, cardinal or apicial, the other 

 post-apicial, long, lamellous and arcuated ; ligament elongated, 

 subexterior and inserted, two very distinct muscular impressions, 

 united by a palleal band, narrow and semicircular. Inhabits the 

 Mediterranean. Twenty-one living species. Four fossil. 



Cardita Ajar. Cardita sulcata, 



C. squamosa. C. turgida. 



C. crassicosta. C. phrenetica, 



