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DIVISION IV. Shell inflected with a longitudinal furrow on the anterior end. 



Scientific name. 

 Pensylvanica, 



Edentula, 



DIVISION V 



Gigantea, 



Lite rata, 



Geographica, 



Eiotundata, 



Undulata, 



Obsoleta, 



Decussata, 



Acaracoides, 



Locality. Scientific name. Locality. 



Pennsylvania, West In- Jamaicensis, Jamaica. 



dies. Spuria, Britain, Mediterranean. 



Jamaica, St. Croix. Globosa, Red Sea. 



Shell suhoval, and slightly angulated on the anterior side. 

 Family 1st. Smooth or striated. 



Florida, Antigua. 



Amboyna. 



Mediterranean. 



I. Ocean, Ceylon. 



E. Ind. Medit. Red Sea. 



Mediterranean. 



I. Ocean, G. Brit. Med. 



Senegalensis, 



Perforans, 



Virginea, 



Aurea, 



Palustris, 



Monstrosa, 



Senegal. 



Plymouth, in Lime-stone. 



E. & \V. Indies, Britain, 



Adriatic. 

 Great Britain. 



do. 

 Nicobar Isles. 



Family 2cL Foliated. 

 New Holland. 



