CONTENTS. 



PAGE 



Corrigenda et Addenda viii 



Synopsis of the Family UxiONiDiE ix 



Division of the Family Union idae xxvi 



Genus Margaron ............... 25 



Subgenus Triquetra .............. 25 



Subgenus Prisodon ■ 27 



Subgenus Unio xiii., 28 



Subgenus Margaritana ............. CT 



Subgenus Flagiodon .............. 71 



Subgenus Monocondylcea ............. 72 



Subgenus Dipsas 74 



Subgenus Anodonta .............. 75 



Subgenus Columba 86 



Subgenus B3"ssanodonta 87 



Genus Platiris ................ 88 



Subgenus Iridina .............. 88 



Subgenus Spatha ............... 89 



Subgenus Mycetopus 90 



Geographical Distribution of the Species of the Family Unionid.e 93 



Genus Margaron 93 



Subgenus Triquetra 93 



Subgenus Prisodon 93 



Subgenus Unio 93 



Subgenus Margaritana 103 



Subgenus Plagiodon .............. 104 



Subgenus Monoeondylcea 104 



Subgenus Dipsas 104 



Subgenus Anodonta .............. 104 



Subgenus Columba .............. 107 



Subgenus Byssanodonta ............. 107 



Genus Platiris 108 



Subgenus Iridina 108 



Subgenus Spatha 108 



Subgenus Mycetopus 108 



Index of Species 109 



Alphabetical List of Works referring to the Unionida? in this volume 149 



Chronological Bibliography of the TJnionidae 157 



Appendix 183 



