142 



ceous epidermis : umbo placed a little to one fide, beneath 

 which is a cordiform deprefTion. Infide gloflTy, filvery 

 white ; hinge angular, befet with numerous, fine, regular 

 teeth in a peftinated form : margin finely crenulated. 

 Length three-eighths of an inch ; breadth fomewhat 

 •more. 



This fpecies is common on mofl; of our fandy fhores. 

 Mr. Pennant has by miftake referred to his Area bar- 

 lata for the figure of this (hell. 



I3EN, 



