INDEX. 



Family Littorinidse 

 Genus Littorina 

 Sub-Genus Tectus 



„ Echinella 



Genus Limnotroclius 



„ Plesiotrochus 

 Sub-Famil^y FossarinaB 

 Genus Eisella . 

 Sub-Genus Peasiella 

 Genus Phaneta . 



„ Fossar 

 Sub-Genus Coutbouyia 

 Genus Conradia 

 Sub-Genus Gottoina 

 Genus Raulinia . 



„ Cithna . 



„ Fossarina 

 Sub-Family Lacuninse 

 Genus Cremnoconchus 



„ Stenotis . 



„ Lacuna . 



„ Modulus . 

 Family Planaxidse 

 Sub-Family LitiopinjB 

 Genus Litiopa . 



„ Styliferina 



„ Diala 



„ Alaba . . 



„ Planaxis . . 



„ Quoyia . 



„ Holcostoma 

 Family Melaniidse 

 Sub-Family Ceriphasinse 

 Genus lo . . 



„ Pleurocera 

 Sub-Genus Strephobasis 

 Genus Goniobasis 

 Sub-Genus Schizostoma 



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