25 

 DIVISION II. Ovate and compressed. 



Scientific name. 

 Triangularis, 

 Oblonga, 

 Spengleri, 



Foliacea, 



Acuta, 



Planata, 



Strigosa, 



Laevigata, 



Madagascarensis, 



Radiata, 



Pallescens, 

 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. 



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, Cura§oa, 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. 



