CONTENTS 



Introduction page 201 



Echinoidea ^°9 



Cidaridae 209 



Arbaciidae ^^S 



Diadematidae 2'° 



Temnopleuridae ^'7 



Echinidae 217 



Echinometridae ^^4 



Hemiasteridae ^^4 



Spatangidae ^34 



Urechinidae ^35 



Ophiuroidea ^3^ 



Gorgonocephalidae ^3" 



Trichasteridae 241 



Ophiomyxidae ^^^ 



Ophiacanthidae 246 



Ophiocomidae 200 



Ophiothrichidae 261 



Ophiactidae 262 



Amphiuridae 2°" 



Ophiochitonidae 298 



Ophiodermatidae 3°^^ 



Ophiolepidae 3°^ 



Ophioleucidae 345 



Index 347 



Plates I-IX following page 2i^ 



