CONTENTS 



INTRODUCTION 1 



Simplified List of Recent Phyla 6 



Simplified List of Recent Classes and Orders, 



with Common Names 9 



Notes on the Taxa 26 



Complete List of Phyla 36 



Complete List of Classes and Orders, 



with Synonyms, Subgroups, and Geologic Range 39 



BIBLIOGRAPHY 72 



INDEX TO COMMON NAMES 75 



INDEX TO LATIN NAMES 80 



