TABLE OF CONTENTS. 



Tage. 



Introduction 1 



Summary of species . 9 



Pelecypoda. 9 



Scaphopoda 57 



Gastropoda 58 



Pteropoda 58 



Opistbobranchiata GO 



Pulmonata 00 



Ctenobranebiata G7 



Nucleobrancbiata 138 



Pectinibrancbiata 139 



Aruphineura 1S6 



Polyplacopbora 186 



Aplaeophora 198 



Synonymic notes 200 



Index to genera 203 



Bibliography 209 



Explanation of plates '. 213 



in 



