iv CONTENTS. 



CHAPTER VIII. PAGB 



ROTIFERS 200 



CHAPTER IX. 



FRESH- WATER POLYZOA 221 



CHAPTER X. 

 ENTOMOSTRACA AND PHYLLOPODA 238 



CHAPTER XI. 



WATER-MITES AND THE WATER-BEAR 260 



CHAPTER XII. 

 SOME COMMON OBJECTS WORTH EXAMINING 274 



GLOSSARY 293 



INDEX... .. 299 



