CONTENTS. 



*age 



Synopsis of the Family Naiades. ..... ... 5 



Division of the Family Naiades. ..... .... 10 



Genus Margarita. 13 



Subgenus Unio. ........... 13 



Subgenus Margaritana. ......... 26 



Subgenus Dipsas. ........... 28 



Subgenus Anodonta. ......... 29 



Genus Platiris. ............ .33 



Subgenus Iridina 33 



Subgenus Spatha. 33 



Addenda. 35 



Geographical Distribution of the Species of the Family Naiades. .... 37 



Genus Margarita. ........... 37 



Subgenus Unio. ........... 37 



Subgenus Margaritana. .......... 40 



Subgenus Dipsas. ........... 41 



Subgenus Anodonta. .......... 41 



Genus Platiris. .......,,. . . 42 



Subgenus Iridina. ........... 42 



Subgenus Spatha. ........... 43 



List of Authors. ............ 44 



