98 JOURNAL OF CONCHOLOGY, VOI,. 1 5, NO. 4, OCTOBER, I916. 



Distribu Hon — 



Red Crag (derivative) Britain 



Scaldisiati Belgium 



Coralline Crag ^ ^^^ Britain 



Lenham Beds ) " 



Diestian ... Belgium. 



Collection — 



M.P.G., No. 402 (associated with Zaria subangulata). 



P^am. PECTINID^. 



Pecten maximus (?) Linnaeus. 



Ostrea maxima Linnaeus : Syst. Naturae, 1758, ed. x., p. 696. 



Distribution — 



Recent ... ... British and Mediterranean Seas 



Red Crag \ . 



Coralline Crag i 



Scaldisian ... ... ... ... Belgium 



Lenham Beds -^ _^ _ g^j^^j^ 



St. Erth Beds / 



^'^^t^^" 1 Belgium. 



Anversian J 



Collection — 



M.P.G., No. 405 (summit fragment only, showing expansions). 



Aequipecten opercularis Linnaeus. 



Ostrea opercularis Linnaeus: Syst. Nat., 1758, ed. x., p. 698. . 

 Aeguipectefi opercularis Sacco : Moll. Terz. Piemonte, 1897, part 

 24, pi. 3, figs. 13-35 (with varieties). 



Distributiofi — 



Recent ... ... British and Mediterranean Seas 



Post-Pliocene ] 



Norwich Crag - Britain 



Red Crag j 



Scaldisian ... ... Belgium 



Astian ^ t.. 1 



Plaisancian J 



Coralline Crag \ 



St. Erth Beds Britain 



Box Stones j 



Diestian ... ... ... ... Belgium 



Messinian ... ... ... Germany (N.). 



Collection — 



M.P.G., No. 406. 



