34 BIVALVES. CARDIUM, 



stices, or spaces between these ribs, are (in perfect Spe- 

 cimens) of a fine dark-brown color, which gives the shell 

 a great boldness of character. 



A great part of this genus inhabits the European and 

 Northern seas; however, many are collected from the 

 American, African, and Indian oceans; the Mediterra- 

 nean, likewise, produces some of tlie species, and the 

 mouths of rivers, as the Tees, Thames, &c. &c-. also sup- 

 ply specimens, though rarely. One species is mentioned 

 as sometimes being found in a fossil state, viz. Cardium 

 lithocardiura. 



CARDlUM.—Coc^Ze or Heart-shell. 



Costatum ( White flu ted H.) Flavum . 

 Cardissa (Venus H.) *Laevigatum. 



Rosenm {Smooth -edffed V.H. S erratum. 

 Retusum (Diana H.J 'Edule (Common C.J 



Hemicardium. Islandicum. 



Lithocardium. Groenlandicum. 



Lineatum. Rusticum. 



♦Medium (MarlledH.J Glaucum. 

 *Aculeatum (Knotted H.) Pectinatum. 

 *Echinatum {RakeH. ShellW irgmenm. 

 *Ciliare. Trilaterum. 



Ciliatum. Auricula. 



*Tuberculatum. Triste. 



Isocardia (Rasp C.J Monstrosum. 



Fragum (White Straivb. C.J Lima. 

 Unedo (Strawberry C.J Ringens. 

 .Muricatum. Pap>raceuni, 



Magnum (Yellow rihhedC. J MoMnwm (.f anus. J 



