viii CONTENTS. 



INVERTEBRATES. 



PAGE 



CHAPTER VII. 

 Protozoa, ....... 85 



CHAPTER VIII. 

 Sponges, . . . . . . .116 



CHAPTER IX. 



CCELENTERA, ....... I29 



CHAPTER X. 

 Unsegmented Worms, ..... i6i 



CHAPTER XI. 

 Segmented Worms or Annelids, .... i86 



CHAPTER XII. 

 ECHINODERMS, ....... 227 



CHAPTER XIII. 

 Crustaceans, .... 



CHAPTER XV. 

 Arachnoidea and Pal/eostraca, 



CHAPTER XVI. 



Molluscs, .... 



252 



CHAPTER XIV. 

 Peripatus, Myriopods, and Insects, . . . 285 



327 



343 



