32 



BIVALVES CHAMA. 



dyli), to affix themselves to any extraneous substance ac- 

 cident throws in their way. They often adliere to rocks, 

 stones, and various shells ; however, they in many instances 

 seem to give a preference to some particular genus of 

 shells, for the Chama Arcinella is more commonly found 

 affixed to thatspecies of Murex called the Thorny Wood- 

 cock, than any other body known. However, it retains 

 a partiality for others of the Murices, especially those 

 often known, under the name of Triplices. The Ameri- 

 can, hidian, and Atlantic Oceans; and the Mediterranean, 

 (Caspian, and Adriatic Seas, all produce infinite varieties 

 of this genus. The Chama Foliacea is found fossil in 

 Campania. 



