Verbreitung in der Zeit. Uebersicht. 



927 





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Eocän 

 Oligocän 



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faß 



Hydrobiidae 

























Ampullariidae _ 

























Paludinidae 



Valvatidae . 











































Melaniidae 

















Cyclostomatidae u. ver w. 

 Cerithiidae . 





2 



2 



2 



2 



2 



^ 



2 





























Nerineidae... 























Cypraeidae 



























! Trichotropidae 

























Struthiolariidae . 



Strombidae 































Chenopodidae _ 





















Cassididae _. . .. 





















Doliidae, Tritoniidae . . 

 Columbellinidae 















?;r^k 



















Nassidae, Buccinidae ... 



























Columbellidae j 













■'■■ 













Muricidae, Purpuridae 



Fusidae (Fascioloriidae 



Mitridae, Marginellidae 



! Volutidae 





















































































^^ i 1 



Harpidae . . 























Olividae 

























Cancellariidae, Terebri- 

 dae 



























Pleurotomidae, Conidae 

 Heteropoda. 



































































