CONTENTS. 



PAGE. 



B. Class Gastropoda 137 



Subclass Anisopleura 138 



Superorder Euthyneura 138 



Order Pulmonata 138 



Suborder Stylommatophora 139 



Monotremata 140 



Sigmurethra 140 



Superfamily Holopoda , 140 



Family Helicidae 140 



Superfamily Agnatha 169 



Family Testacellidse 169 



Superfamily Agnathomorpha 171 



Family Circinariidae 171 



Superfamily Aulacopoda 174 



Family Zonitidae '. . 174 



Family Limacidas 193 



Family Philomycidae 200 



Family Endodontidae 203 



Heterurethra 216 



Superfamily Elasmognatha 216 



Family Succineidas 216 



Orthurethra 225 



Family Pupidae 225 



Family Cochlicopidae 245 



Family Valloniidae 248 



Suborder Basommatophora 253 



Superfamily Gehydrophila 253 



Family Auriculidae 253 



Superfamily Hygrophila 256 



Family Limnaeidte 257 



Family Ancylidae 302 



Family Physidse ." 307 



Superorder Streptoneura 319 



Order Ctenobrancbiata 319 



Suborder Streptodonta 319 



Superfamily Taanioglossa 319 



Family Pleuroceridae 319 



Family Amnicolidae 327 



Family Valvatidae 346 



Family Viviparidae 352 



XI. Chicago Bibliography 363 



XII. Bibliography of Works Referred to in this Publication 366 



XIII. Glossary 381 



XIV. Appendix 391 



Index... . 411 



