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DIVISION II. Shell depressed, and whorl coiled horizontally. 

 Family 1st. Umbilicated. 



Scientific name. 

 Cornea, 



Similis, 



Spirorbis, 



Polygrata, 



Locality. 

 Stagnant waters in Eu- 

 rope. 

 Denmark, Berlin. 

 Britain, France. 



Scientific name. Locality. 



Contorta, Europe. 



Alba, England, Denmark. 



Crystallina, do. do. 



Cornu arietis, Amboyna. 

 Cornu venatorium, 



Planorbis, 

 Complanata, 



Europe 

 do. 



Family 2d. Imperforate and heeled. 



Vortex, Europe. 



DIVISION III. Shell with the aperture sublunate. 



Family 2cL Umbilicated and subglobidar. 



