PLATE XLV. 



It is found on many of our shores, as Kent, Sussex, Dorsetshire, 

 &c. in abundance, and of various colours ; some are very fine like 

 japan lacquer, and others of a violet, green, pink, yellow or pearly 

 tint when much worn. It is remarkable, however, that the upper 

 valves are so scarce, that hundreds of the lower valves are found to 

 one of them. 



