QL 403.5 

 . 891 

 14 



CONTENTS. 



PREFACE v * 



I NTRODUCTION 1 



NOMENCLATURE 13 



GENERIC SYSTEM 35 



SPECIFIC DESCRIPTION 119 



TRIVIAL NAMES 182 



TESTACEOLOGICAL WRITERS 203 



TABLE OF COLOURS 24<> 



LIST OF PLATES • 243 



