CONTENTS. 



1'AliK 



Corrigenda et Addenda ................ viii 



Synopsis of the Family Naiades ............. ix 



Division of the Family Naiades ............ xviii 



Genus Margaron ............... 17 



Subgenus Triquetra .............. 17 



Subgenus Prisodon .............. 18 



Subgenus Unio ............... ^% tQ 



Subgenus Margaritana ............. 42 



Subgenus Monocondyloea . . ........... .45 



Subgenus Dipsas .............. 46 



Subgenus Anodonta .............. 47 



Genus Platiris ............... 54 



Subgenus Iridina ............... 54 



Subgenus Spatha .............. 55 



Subgenus Mycetopus . . . . . . . . . . . . . .56 



Geographical Distribution of the Species of the Family Naiades ......... 59 



Genus Margaron ............... 59 



Subgenus Triquetra .............. 59 



Subgenus Prisodon .............. 59 



Subgenus Unio ............... 59 



Subgenus Margaritana . . . ... . - . . . . . . . .64 



Subgenus Monocondyloea ............. 64 



Subgenus Dipsas ................ 64 



Subgenus Anodonta ............... 64 



Genus Platiris ................ 66 



Subgenus Iridina .............. 66 



Subgenus Spatha ............... 66 



Subgenus Mycetopus .............. 66 



Index of Species ................. 67 



Alphabetical List of Works referring to the Naiades .......... 85 



