X CONTENTS 



INVERTEBRATES 

 CHAPTER VII 



PAGE 



Protozoa. ....... 109 



CHAPTER VIII 

 Sponges . . . . . . . -153 



CHAPTER IX 



CCELENTERA . . . . . . . 167 



CHAPTER X 



Unsegmented Worms . . . . . .210 



CHAPTER XI 

 Annelids ....... 244 



CHAPTER XII 



ECHINODERMS ....... 289 



CHAPTER XIII 

 Arthropoda ....... 319 



CHAPTER XIV 



Onychophora or Prototracheata, Myriopoda, and 



Insecta ....... 361 



CHAPTER XV 

 Arachnoidea and Pal^ostraca . . . .412 



CHAPTER XVI 

 Molluscs ....... 433 



