Vm CONTENTS. 



greographical distribution of the mollusca, . . . 152 

 Marine Provinces, . . . . . . .156 



Bathymetrical Distribution op Marine Mollusks, . 114 

 Land Regions, ........ 118 



Hypsometrical Distribution of Land and Fresh- 

 water Mollusks, 206 



List of Works on Geographical Distribution, . .209 

 Principal Iconographic Works on G-eneral Con- 



CHOLOGY, . 214 



Conchological Periodicals, 215 



Systematic Works, .. . . . . .215 



Distribution OF the Mollusca in Time, . . . .216 



Table of Sedimentary Deposits, .... 224 



Fossil Mollusks of the Paleozoic Period, . . 231 

 Fossil Mollusks op Mesozoic Time, .... 233 



Neozoic Fossil Mollusks, . . . . . . 235 



Terrestrial and Fluviatile Fossil Mollusks, . . 236 

 Table of Characteristic Genera, .... 239 



Range op Genera in Time, 240 



Range op Families in Time, . . . . .241 



Nomenclature, 247 



Classification, 252 



Arrangement of Families : by Theodore Gill, . . 263 



On Collecting Shells, 270 



