CONTENTS 



FAGE 



Preface v 



List of Illustrations ix 



Enchytr^id^, by Gustav Eisen. 



Introduction i 



Explanation of Terms 3 



Importance of Penial Bulb in Classification 6 



Synopsis of Subfamilies and Genera 11 



Systematic Discussion of Genera and Species 13 



Bibliography 121 



Abbreviations used in the Text Figures 124 



Abbreviations used in the Plates 125 



Index to Genera and Species 126 



TuBicoLous Annelids, by Katharine J. Bush. 



Introduction 1 69 



Species previously recorded from the Pacific 172 



New Genera 178 



Species new to the Region 179 



Systematic Discussion 183 



Notes 01a Genus Spirorbis 252 



Bibliography 269 



Addendum 287 



Index to Genera and Species 292 



Volume Index 347 



(vii) 



