x CONTENTS. 
CHAPTER VII. 
BRANCH VII. CRUSTACEANS AND INSECTS (ARTHROPODA) 
CHAPTER VIII. 
BRANCH VIII. Sea-Squirts (TUNICATA) . . 
CHAPTER IX. 
ee 
BRANCH IX. BACKBONED ANIMALS (VERTEBRATA) 
PAGE 
76 
« 145 
. 150 
