TABLE OF CONTENTS. IX 



Page. 



Key to the species of the subgenus Salassia 134 



Odoetomia (Salassia) tropidita 134 



scalariformis 135 



Subgenus Besla 135 



Key to the species of the subgenus Besla 135 



Odostomia ( Besla ) convexa 135 



callimorpha 136 



Subgenus Chrysallida 136 



[\ey to the species of the subgenus Chrysallida 137 



Odostomia (Chrysallida) reigeni 138 



inconspicua 139 



telescopium 139 



excelsa 140 



acrybia 141 



communis 141 



torrita 142 



licina 143 



talania 143 



effusa 144 



paupercula 144 



clathratula 145 



ritteri ..l. 146 



rinella 146 



eugena 147 



trachis 148 



lucca 148 



Clementina 149 



oonisca 150 



oldroydi 150 



nodosa 151 



ovata 152 



cincta 152 



loomisi 153 



vicola 153 



astricta 154 



cooperi 155 



hipolitensis 155 



lapazana 156 



proxima 157 



tyleri 157 



scammonensis . - 158 



pulchra _. 158 



montereyensia 159 



pulcia 160 



virginalis 160 



defolinia 161 



contracta 162 



<Hfficili8 162 



oregonensis 162 



beuthina 163 



promeces 164 



pulcherrima i 164 



vincta 165 



