Vlll CONTENTS. 



PAGE 



CHAPTER X. 

 INSECTS : THEIR EARS AND EYES 158 



CHAPTER XL 

 CRABS AND SHRIMPS 171 



CHAPTER XII. 

 BARNACLES. . . . '.,, ,. . .' 191 



CHAPTER XIII. 

 SPIDERS AND MITES . 203 



CHAPTER XIV. 

 WHEEL-BEARERS . 223 



CHAPTER XV. 

 WORMS. ...'. . . . . . . .258 



CHAPTER XVI. 

 SEA-URCHINS AND SEA-CUCUMBERS 276 



CHAPTER XVII. 

 JELLY-FISHES .,;..', 307 



CHAPTER XVIII. 

 ZOOPHYTES . . . 325 



CHAPTER XIX. 

 SEA-ANEMONES : THEIR WEAPONS 355 



CHAPTER XX, 

 PROTOZOA AND SPONGES 376 



CHAPTER XXI. 



INFUSORIA . . 389 



