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Yet in his grotto work enclosed, 

 He nothing feels, in that rough coat, 

 Save when the knife is at his throat; 

 Wherever driven by wind or tide, 

 Exempt from every ill beside. 



Cowper. 



Scientific name. 

 Maxima, 

 Jacobosa, 

 Ziczac, 



DIVISION I. Valves with ears equal. 

 Family 1st. Valves ribbed, upper valve flat. 



Locality. 

 European Seas. 

 Britain, Mediterranean. 

 West Indies, Red Sea. 



Scientific name. Locality. 



Striatula, Indian Ocean. 



Minuta, do. 



Ilybrida, 



Radula, 



Imbricata, 



Family 2d. Valves ribbed, ears equal. 



Norway. 



Amboyna, China. 

 Red Sea. 



Plica, 

 Hyans, 



Amboyna, Indian Sea. 

 Norway. 



Family 3d. Valves thickish on one side and gaping. 



Lima, Ceylon, Med., Red Sea. 



Fasciata, Brit., W. I., C. G. Hope. 



Bullata, Mediterranean. 



Fragilis, Nicobar Isles. 



Scabra, 

 Glacialis, 

 Excavata, 

 Loscombia, 



West Indies. 



St. Domingo, Med. 



Norway. 



Devonshire. 



Family 4th. Valves smooth or striated, and not closing. 



Plurancetes, 

 Japonica, 



Amboyna, Molucca. 

 China, Japan. 



Magellanica, 



Magellan. 



DIVISION II. Valves with unequal ears. 

 Family 1st. Ribbed valves. 



Pes Lutrte, 



Pallium, 



Sansfuinolenta, 



Palliata, 



Nodosa, 



Pesfelis, 



Sulcatis, 



Cinnabarica, 



Senatoria, 



Citrina, 



Pellucens, 



Obliterata, 



Sanguinea, 



Porphyria, 



Varia, 



Amhoyna, China. 

 Red Sea. 

 Mediterranean. 

 Africa, E. & W. Indies, 

 do. Medit. 



Norway, Brit., America. 

 Moluccas. 

 Indian Isles. 

 West Indies. 

 Moluccas, So. of Europe. 

 W. Indies, South Seas. 

 Red Sea. 

 Britain, Med. 



Sauciata, 



Pusio, 



Sinuosa, 



Miniata, 



Triradiata, 



Solaris, 



Glabra, 



Opercularis, 



Linneata, 



Nucleus, 



Gibba, 



Turgida, 

 Pyaidata, 

 Flavicans, 



Red Sea. 

 Nicobar Isles. 

 Britain. 



Norway, Denmark. 

 Adriatic. 

 Med., Portugal. 

 Britain, America. 



do. 

 East Indies. 

 South America, Africa, 



W. Indies. 

 E. & W. Indies. 

 Malabar. 

 Southern India. 



