CARDILIA. 461 



Genus BUCARDIA, Lister. 



Shell heart-shaped, ventricose, equivalve, smooth or fur- 

 rowed ; beaks prominent, contorted ; margin of valves en- 

 tire. Hinge composed of two erect primary teeth (one of 

 them indented) parallel with the margin in one valve, and 

 three in the other; a lateral tooth and tooth-like socket; 

 ligament external, furcate anteriorly. Muscular impressions 

 small ; pallial sinus none. 



Syn. Glossus, Glossoderma, Poli. Buccardium, Miihlf. 

 Isocardia, Lam., not Klein. 



Ex. B. cor, Linnaeus, PL 1 J 2, fig. 5. Shell, B. cor, fig. 

 5, a, 5, b. 



Of this genus, the example given, B. cor, is an inhabitant 

 of the seas of Europe. The other species, forming the sub- 

 genus Meiocardia, are entirely from China and the Philip- 

 pines. 



Species of Bucardia. 



cor, Linn. 



Sub-gen. meiocardia, H. and A. Adams. 



Shell with the surface of the valves concentrically grooved, 

 not covered with an epidermis. 



Laruarckii, Sow. tetragona, Adams and Reeve. 



Moltkiana, Chem. vulgaris, Reeve. 



Genus CARDILIA, Deshayes. 



Shell oval-oblong, longitudinal, white, cordiform, ventri- 

 cose ; beaks large, prominent. Hinge with a small cardinal 

 tooth, and at its side a fossette ; a spoon-shaped cavity to 



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