TABLE OF FAMILIES AND OBNERA. XXlll 



Page 



Family SCALIDiE 210 



Scala 210 



Acirsa 214 



Foratiscala 214 



Littoriniscala 215 



Aclis 216 



Family C^CID^ 216 



Caicum 216 



Strebloceras 216 



FamUy VERMETIDjE 217 



Thylacodes 217 



Family XENOPHORID^ 218 



Xenophora 218 



Family SOLARIID^ 219 



Solarium 219 



Philippia 221 



Homalaxis 221 



Discohelix 222 



Family LITIOPIDiE 222 



Litiopa 222 



FamUy LITTOEINID^ 223 



Littorina 223 



Lacuna 223 



Family VIVIPARID^ 225 



Viviparus , 225 



Family ASSIMINIID^ 226 



Assiminea 226 



