35 



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



Scientific name. Locality. "Scientific name. Locality. 



Pensylvanica, Pennsylvania, West In- Jamaicensis, Jamaica. 



dies. Spuria, Britain, Mediterranean. 



Edentula, Jamaica, St. Croix. Globosa, Red Sea. 



DIVISION V. Shell suboval, and slightly angulated on the anterior side. 

 Family 1st. Smooth or striated. 



Gigantea, 



Literata, 



Geographica, 



Rotundata, 



Undulata, 



Obsoleta, 



Decussata, 



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. & W. Indies, Britain, 



Adriatic. 

 Great Britain. 



do. 

 Nicobar Isles. 



Agaracoides, 



Family 2d. Foliated. 

 New Holland. 



