XXiy TABLE OP FAMILIES AND GENERA. 



Family PALUDESTRINID^ ..:.... 226 



Paludestrina 226 



Tomichia 227 



Pyrgula 228 



Bit.hinella 229 



• Stenothyra 229 



Family RISSOID^ 231 



Rissoa 231 



Rissoina 232 



Cossmannia 233 



Tatea 233 



Potamaclis 233 



Paryphostoma 234 



Diastema 235 



Family ADEORBIID^ 235 



Adoorbis 235 



Family NATICID^ 237 



Natica 237 



Ampullina 241 



Family CALYPTR^ID^ 245 



Calyptraea 245 



Family CAPULID^ 247 



Capulus 247 



Hipponyx 248 



FamUy POMATIIDiE 248 



Pomatias 248 



Family CYCLOPHORID^ 249 



Cyclotus ■. . . 249 



Craspcdopoma 249 



Hartmannia 249 



