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Scientific name. 

 Argo, 



Tuberculata, 

 Hians, 



Vitrea, 



Cymbium, 



DIVISION I. Keel toothed. 

 Family 1st. Summit interiorly curved 

 Scientific name. 



Locality. 

 Cape of Good Hope. 

 So. Seas, Brazils. 

 China, Red Sea. 



Locality. 



Gondola, Mozambique, Mauritius. 



Haustrum, East Indies. 



Arctica, 



Family 2d. Summit exteriorly curved. 

 Amboyna. 



DIVISION II. Keel not toothed. 

 Mediterranean. Cornu, Cape of Good Hope. 



DIVISION III. Umbilicus perforated. 

 Greenland. 



