TABLE OF CONTENTS. 



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Page, 



INTRODUCTION 187 



CLASSIFICATION 189 



Aplacophora 189 



Chaetodermatidae 189 



Chaetoderma 190 



Neomeniidae 191 



Neomenia 191 



Proneomemidae 191 



Proneomenia 191 



Dorymenia 192 



Strophomenia 192 



Dondersiidae 192 



Nierstrassia 193 



DESCRIPTION OF SPECIES ... 193 



Chaetoderma nitidulum 193 



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Chaetoderma caudatum 193 



C. vadorum 195 



C. lucidum 198 



C. bacillum 201 



C. squamosum 204 



Neomenia verrihi 206 



Proneomenia acuminata 215 



Dorymenia peroneopsis 222 



Strophomenia agassizi 229 



Nierstrassia fragile 235 



EMBRYOLOGY 240 



GENERAL CONSIDERATIONS ... 251 



BIBLIOGRAPHY 261 



EXPLANATION OF PLATES ... 263 



