TABLE OF CONTENTS. IX 



Systematic list — Continued . 



Class Gastropoda — Continued. 



Order Orthodonta — Continued. p age . 



Family Turbinidae 146 



Genus Turbo 146 



Genus Astraea 146 



Genus Leptothyra 146 



Family Trochidae 150 



Genus Claneulus 150 



Genus Oxystele 151 



Genus Umbonium 153 



Genus Gibbula 153 



Genus Solariella 161 



Genus Calliostoma 161 



Genus Euchelus 163 



Genus Cynisca 163 



Genus Teinostoma 165 



Family Liotiidae 166 



Genus Ilaira 166 



Genus Lippistes 166 



Family Vitrinellidae 167 



Genus Vitrinella 167 



Genus Cyclostrema 169 



Genus Cyclostremella 169 



Genus Caporbis 170 



Genus Pondorbis 171 



Genus Diseopsis 171 



Genus Leptogyra 173 



Family Neritidae 174 



Genus Nerita 174 



Genus Neritina 174 



Family Haliotidae 174 



Genus Haliotis 174 



Family Scissurellidae ' 175 



Genus Scissurella 175 



Genus Schismope 176 



Family Fissurellidae 176 



Genus Fissurella 176 



Genus Pupillaea 176 



Genus Fissuridea 177 



Genus Puncturella 177 



Order Polyplacophora 178 



Family Ischnocbitonidae 178 



Genus Callochiton 178 



Genus Ischnochiton 178 



Genus Dinoplax 179 



Family Acantbocbitidae 180 



Genus Acanthocbites 180 



Family Chitonidae 180 



Genus Chiton 180 



