Vin TABLE OF CONTENTS. 



Systematic list — Continued. 



Class Gastropoda — Continued. 



Order Orthodonta — Continued. Page. 



Family Cerithiidae 116 



Genus Cerithiuni 116 



Family Planaxidae 117 



Genus Planaxis 117 



Family Caecidae 117 



Genus Caecum 117 



Family Vermetidae 117 



Genus Vermicularia 117 



Genus Siliquaria 117 



Family Turritellidae 118 



Genus Turritella 118 



Family Littorinidae 119 



Genus Littorina 119 



Genus Tectarius 120 



Genus Cithna 120 



Family Litiopidae 121 



Genus Alaba 121 



Genus Alabina 121 



Genus Diala 122 



Family Solariidae 123 



Genus Heliacus 123 



Family Rissoidae 125 



Genus Nodulus 125 



Genus Sabanaea 125 



Genus Amphithalamus 126 



Genus Alvania 127 



Genus Rissoina 130 



Genus Microsetia 132 



Genus Barleeia 134 



Genus Fenella 134 



Family Jeffreysiidae 134 



Genus Jeffreysia 134 



Family Assimineidae 135 



Genus Assiminea 135 



Family Calyptraeidae 136 



Genus Trochita 136 



Genus Crepidula 136 



Family Lamellariidae 137 



Genus Lamellaria 137 



Family Naticidae 137 



Genus Natica 137 



Family Vanikoroidae 140 



Genus Vanikoro 140 



Family Acmaeidae 141 



Genus Acmaea 141 



Family Patellidae 141 



Genus Patella 141 



Genus Helcion 144 



Family Phasianellidae 144 



Genus Phasianella 144 



