TABLE OF CONTENTS. 
Page. 
DEDICATION. iii 
TABLE OF CONTENTS. v 
ADDENDA AND CORRIGENDA. vi 
PREFACE.vii-x 
SYNOPSIS OF THE GENERA.xi-xiv 
INDEX. ' . . . xv-xviii 
DESCRIPTIONS OF SPECIES . . ... . . ... . 1-268 
Aviculopecten. 1-40 
Lyriopecten.40-57 
Pterinopecten.57-81 
Crenipecten.81-90 
Pterinea.91-103 
S. G. Vertumnia.104^107 
Actinopteria.107-128 
Ptychopteria . 129-152 
Glyptodesma. 153-157 
Leiofteria.158-174 
Leptodesma . . . . 175-236 
Pteronites. 237-239 
Pal^opinna. 240-241 
Ectenodesma. 242-243 
Limoptera. 243-251 
Byssopteria.252 
Mytilarca.. . . . 253-264 
S. G. Plethomytilus. 253-256 
Gosselettia. 265-266 
Modiola, S. G. Mytilops.. . . 267-268 
PLATES AND EXPLANATIONS.i-xxxm and lxxxi-xcii 
