TABLE OF CONTENTS. 



J ' a ■ ; i . . 



DEDICATION m 



TABLE OF CONTENTS v 



ADDENDA AND CORRIGENDA vi 



PREFACE vii _ x 



SYNOPSIS OF THE GENERA ; x i_xi v 



INDEX . - xv-xviii 



DESCRIPTIONS OF SPECIES 1-268 



Aviculopectex 1_40 



Lyriopecten 40-57 



Pterinopectex 57-81 



Crexipectex 81-90 



Pterixka 01-103 



S. G. Yertcaixia 104-107 



Actixopteria ............. 107-128 



Pttchopteria 129-152 



Gltptodesma 153-157 



Leiopteria 158-174 



Leptodesma 175-236 



Pteronites 2::7-239 



Paljsopinxa 240-211 



Ectenodesma 242-243 



Limoptera 24:5-251 



Btssopteria 252 



Mytilaf.i a 253 264 



S. G. Plethomytilus 253-256 



Gosselettia 265 266 



Modiola, S. G. Mytilops 267-268 



PLATES AND EXPLANATIONS i-xxxiii and Lxxxr-xcii 



