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Family c 2d. Suborbicular, margins crenated or plaited. 



Scientific name. Locality. Scientific name. 



Pectunculus, South America, Red Sea. Glycymeris, 



Pectinata, West Indies. 



Decussata, East & West Indies. Pilosa, 



Pallens, India. Stellata, 



Undata, West Indies, Med. Scripta, 



Nutnmaria, 



Locality. 

 Red Sea, Guernsey. 

 Britain, Mediterranean. 

 Med., Britain, Spain. 

 Portugal, Africa. 

 St. Domingo. 

 Mediterranean, Spain. 



Multistriata, 



Family 3d. Suborbicular, margin entire. 

 Red Sea. 



DIVISION III. With the teeth of the hinge produced and sharply pointed. 



Nucleus, Britain, Mediterranean, Minuta, 



St. Domingo. Tenuis, 



Rastrata, Norway, Scotland. 



Baltic, Britain. 

 Dunbar, Leith Roads. 



