CONTENTS. 
Page 
Introduction. 
The MoUusca of the Tai-Hu compared with those of I^ake Biwa . . . . 301 
List of the Mollusca of the Tai-Hu . . . . . . . . 301 
Distribution of the Mollusca into zones of life . . . . . . 302 
Smallness of all the species . . . . . . . . . . 302 
Estuarine element in the fauna . . . . . , . . . . 303 
Geographical relations of the fauna . . . . . . . . 303 
vSystematic Description of the Collection. 
Family I,imnaeidae . . . . . . . . . . 304 
Family Melaniidae . . . . . . ' . . . . 304 
Family Hydrobiidae . . . . . . . . . . 305 
Family Assimineidae .. .. .. .. ..312 
Family Viviparidae . . . . . . . . . . 313 
Family Mytilidae . . ... . . . . . . 315 
Family Unionidae . . . . . . . . . . 316 
Family Cyrenidae . . . . . . . . . . 317 
The supposed occurrence of Area with freshwater Mollusca in the Yangtse . . 318 
Bibliography . . , . . . . . . . . . 319 
