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Scientific name. 

 Argo, 



Tuberculata, 

 Hians, 



Vitrea, 



Cymbium, 



Arctica, 



DIVISION I. Keel toothed. 

 Family 1st. Summit interiorly curved. 



Locality. Scientific name. Locality. 



Cape of Good Hope. Gondola, Mozambique, Mauritius. 



So. Seas, Brazils. Haustrum, East Indies. 

 China, Red Sea. 



Family Id. Summit exteriorly curved. 



Amboyna. 



DIVISION II. Keel not toothed. 

 Mediterranean. Cornu, Cape of Good Hope. 



DIVISION III. Umbilicus perforated. 

 Greenland. 



