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DIVISION II. Ovate and compressed. 



Scientific name. 

 Triangularis, 

 ( >blonga, 

 Spengleri, 



Foliacea, 



Acuta, 

 Planata, 



Strigosa, 



Laevigata, 



Madagascarcnsis, 



Radiata, 



Pallcscens, 

 Rostrata, 



Rufescens, 

 Flavescens, 

 Hyalina, 



Locality. 



European Ocean. 

 Nicobar Isles, Coroman- 



del, China. 

 Amboyna, Molucca Isles, 



West Indies. 

 West Indies. 

 Eu. and Med. Seas. 

 West Coast of Africa, 



Molucca Isles. 

 European and Indian 



Oceans, West Indies. 

 Coasts of Madagascar, 



Coromandel. 

 Eu. Ocean, Bahamas, As- 

 cension Isl. W. Indies. 

 E. Indian Seas. 

 Amboyna, Java, Tran- 



quebar. 

 Coasts of Brazil. 

 E. Indian Seas. 

 Coasts of Guinea. 



Scientific name. 



Inaequivalvis, 



Trifasciata, 



Coccinea, 

 Incarnata, 



Opalina, 



Lanceolata, 



Sanguinea, 



Nivea, 



Sulcata, 



Donacina, 



Augusta, 



Truncata, 



Punicea, 



Depressa, 

 Fabula, 



Tenuis, 



Vitrea, 



Striata, 



Balaustina, 



Calcaria, 



Locality. 

 Medit., Norway, Britain, 

 European Ocean. 

 Mediterranean. 



Do. Sweden. 

 Nicobar Isles, Tarentum. 

 East Indian Seas. 



American Ocean. 



Mediterranean, Britain, 



Frith of Forth. 



Java. 



W. I. Seas, Britain, Gui- 

 nea, Rhode Island. 



Coasts of Britain. 



Med. Coasts of Norway 

 and Am.,W. Ind.&Brit, 



Coasts of Britain. 



Baltic, Northern Ocean. 



Coasts of Dorsetshire. 



Mediterranean. 



C. of Iceland, Ferroe Isl. 



DIVISION III. Suborbicular. 



Remies, 



Fausta, 

 Reticulata, 

 Cancellata, 

 Guinaica, 



Scabra, 



Crassa, 



Decussata, 



Cordiformis, 



Muricata, 



Scobinata, 



Lactea, 



Rotundata, 



Flexuosa, 



Carnaria, 



Zonata, 



Eu. and Indian Oceans, 

 C. of Am. Nicobar I. 

 W. Indies, Dorsetshire, 

 do. do. Britain. 

 Coasts of Goree. 

 C. of Guinea, Frith of 



Forth. 

 W. Indian Seas. 

 Guernsey, Brit. Norman. 



W. I. Seas 



do. do. C.ofTer. Fir. 

 Asiat.Ocean, C. of Surat. 

 Jamaica, and Barbadoes. 

 Med. Lisbon, Britain. 

 Norway, Senegal, do. 

 Coasts of Britain. 

 W. Indies, Curacoa, do. 

 Med., Brit, W. Indies. 



Bimaculata, 



Balthica, 

 Pisiformis, 



Divaricata, 



Dentata, 



Digitaria, 



Cornea, 



Lacustris, 



Amnica, 



Pusilla, 



Limosa, 



Fluminalis, 



Hermaphrodita, 



Fluminea, 



Fluviatilis, 



Eu. Ocean, E. and W. 

 Ind. Seas. 



The Baltic. 



Mo. of Rivers in the Eu- 

 ropean Seas. 



C. of Brazil, Med. Am. 

 Seas, Naples. 



Med., Nicobar Isles. 

 Riv. & Ponds in Europe. 

 Denmark, Britain. 



do. do. 



Rivers in Europe & Virg. 

 do. in South America, 

 Euphrates. 

 Guinea. 



Rivers of China, 

 Canton. 



