CONTENTS 



Introduction page 165 



Acknowledgements 165 



I. Systematic ... 166 



Ianthina ianthina .166 



Ianthina globosa . . . ■ ■ ■ ■ ■ ■ ■ .167 



Atlanta peroni . 169 



Limacina inflata ........... 170 



Limacina bulimoides . . . . . . ■ ■ ■ .171 



Ecology — Depth distribution 172 



Diacria trispinosa 175 



Euclio pyramidata . . . 176 



Cavolinia inflexa 176 



Cymbulia peroni . . . . . ■ ■ • ■ • .176 



Thliptodon diaphanus 177 



Pneumodermopsis paucidens 178 



Lamellibranch larvae •• . • .181 



Cephalopod larvae 182 



II. Reproductive system and sexual succession of Limacina bulimoides 183 



(i) The Gonad and Genital Tract 184 



(ii) The Genital Ducts 185 



(iii) Sexual Succession 194 



(iv) Sex in Gastropoda 196 



Summary 197 



References 198 



