xiv ' • CONTENTS 



Page 



CHAPTER XII 

 Phylum Mollusca 184 



CHAPTER XIII 

 Phylum Arthropoda — Introduction and Class Crus- 

 tacea 203 



CHAPTER XIV 

 Phylum Arthropoda Exclusive of Crustacea and 



Insecta 225 



CHAPTER XV 

 Phylum Arthropoda {Concluded) 236 



CHAPTER XVI 

 Phylogeny 253 



Index 263 



