CONTENTS 



Preface 239 



Introduction *. 241 



Methods and apparatus .,„ 241 



Methods of killing and manipulating , 241 



Habits - 24 1 



Polygyra albolabris 244 



Shell 244 



External features 245 



Movement 247 



Food — carnivorous habits 247 



Digestive system , 249 



Pedal gland 254 



Generative system ._..... » 255 



Description of a species of Entozoa 261 



Circulatory system 262 



Nervous system 268 



^ Special organs of sense 272 



Limax maxim us L. 277 



Digestive system. 278 



Generative system 279 



Circulatory system. 280 



Nervous system, 283 



Muscular system 287 



Embryology. 290 



Time of laying eggs 293 



Rate of growth _ 294 



Explanation of plates 



Polygyra albolabris, plates I-14 295 



Limax maximus, plates 15-28 302 



Index , 313 



