TABLE OF CONTENTS 



PART II 



PAGE 



§ XII. Relation of Apus to the other Crustacea— 

 LiMULUs 173 



§ XIII. The Trilobites 209 



§ XIV. The Eurypterid/E 237 



§ XV, The New Classification proposed 252 



§ XVI. Peripatus and the Tracheata 279 



APPENDICES 291 



LITERATURE 3^3 



