36 



BIVALVES. CARDIUM. 



has rows of white hollow elevated ribs, situated at regu- 

 lar distances on its surface, and proceeding in a longitudi- 

 nal direction from the beaks to the margin; the inter- 

 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 seasj many are collected from the American, 

 African, and Indian oceans; the Mediterranean, likewise, 

 produces some of the species; and the mouths of rivers, 

 as the Tees, Thames, &c. also supply specimens, though 

 rarely. One species is mentioned as sometimes being 

 found in a fossil state, viz. C. lithocardium. 



CARDIUM.— Coc^fe or Heart-Shell 



Costatum. — Pipe-ridged. 

 Cardissa. — Venus' s heart. 

 Roseum. — Smooth-edged 

 Retusum. — Diana^s H. \ral. 

 Hemicardium. — Suhquadrilate- 

 Lithocardium. — Suhtrilateral. 

 Lineatum. — Streaked. 

 *Medium. — Marbled. 

 *Aculeatum. — Knotted. 

 *E chinatum. — Rake. 

 *Ciliare. — Fringed. 

 Ciliatum. — Ciliated. 

 * T uberculatum — Tu berculated. 

 Isocardia. — Rasp. 

 Fragum. — White Strawberry. 

 Unedo. — Straw berry. 

 Muricatum. — Prickly. 

 Magnum. — Yellow ribbed. 

 Flavum. — Yellow. 



*Laevigatum. — Smooth. 

 Serratum. — Egg-cockle. 

 *Edule. — Common. 

 Islandicum. — Islandic. 

 Grcenlandicum. — Greenland. 

 Rusticum. — Banded. 

 Glaucum. — Glaucous. 

 Pectinatum. — Pectinated. 

 Virgineum. — Equilateral. 

 Trilaterum. — Trilateral. 

 Auricula. — Eared. 

 Triste. — Oval. 

 Monstrosum. — Recurved. 

 Lima. — Asiatic. 

 Ringens. — Toothed. 

 Papyraceum. — Paper. 

 iEolicum. — Janus. 

 Oblongum. — Oblong. 

 Crassum. — Thick. 



