BIVALVES. CHAMA. 



40 



dyli), to affix themselves to any extraneous substance 

 wliich accident may" throw in their way. They often 

 adhere to rocks, stones, and various shells; but, in many 

 instances, they seem to have a preference for some par- 

 ticular genus of shells; for the C. arcinella is most com- 

 monly found affixed to that species of Murex called the 

 thorny woodcock ; however, it retains a partiality for 

 others of the murices, especially those often known under 

 the name of trip) ices. 



The American, Indian, and Atlantic Oceans; and the 

 Mediterranean, Caspian, and Adriatic Seas, produce in- 

 finite varieties of this genus. 



The C. foliacea is found fossil in Campania. 



CHAMA.— Clam. 



A. — Closed. 



*Cor. — Fool's Cap. 

 Moltkiana — Moltldan's. 

 Hippopus — Bear's Paw. 

 Antiquata — Antiquated. 

 Trapezia — Trapeziform. 

 Semiorbiculata — Suhorhicular. 

 Calyculata — Variegated. 

 Cordata — Heart-shaped. 

 Satiata — Obsolete. 

 Oblonga — Oblong. 

 Lazarus — Jagged. 

 Gryphoides — Gryphus. 



Bicornis — Horned. 

 Arcinella — Hedge-Hog. 

 Concamerata — Chambered. 

 Macerophylla — Fir-apple. 

 Foliacea — Leafy. 

 Arata — Furrowed. 

 Fusca — Brown. 

 Citrea — Citron. 

 Thaca — Burrower. 

 Rugosa — Rugged. 

 Gryphica — Griffin. 

 Coralliophaga — Coral. 



B. — Gaping. 

 Gigas — Furbelowed Clamp, Giant Clam. 



