54 SHELLS. Class VI. 



Mercenaria. Lin. Syft. 1131. No. 123. Faun. Suec. No. 2144, Z^/?. «^«^/. 

 47.C0MMER- tab. iv. _/%. 22. 

 CIAL. Concb. tab. 272. 



V. with a flrong, thick, weighty fhell, covered 

 with a brown epidermis ; pure white within -, 

 flightly ftriated tranfverfely. 



Circumference above eleven inches. 



Thefe are called in North America Clams ; they 

 differ only in having a purple tinge within. Warn- 

 fum or Indian money is made of them *. 



Tab. liii. fig. 47. 



JErycina. Lin. Syft* 1 13 1. No. r22. Lift. Conch, tab. 284. 



48. Sici- 



lia: 



qUATED. 



V. with a very thick fhell, marked with high- 

 ridged ribs tranfverfely ; undulated longitudi- 

 nally. 



Fig. 48. A. a worn fhell. 



Circumference about five or fix inches. 



Tab. IW.Jig. 48. 48. A. 



Exoleta. Lin. Syft. 1134. No. 142- 



49. Anti- 



V- with orbicular fhells, with numerous tranfverfa't 

 ftri<£\ white, glofTy. 



* Burnabys Travels, p. 104. td. 2- 



Diameter 



