CONTENTS. 



Echinoidea. 



Page 



Introduction 3. 



Suborder Clypeastroidea 28. 



Fam. Fibulariidse 28 



Echinocyamus pusillus (O. F. Miill.) 28. 



Suborder Meridosternata 39, 



Fam. Urechinidse 39. 



Urechinus naresianus A. Ag 39 



Plesechiuus hirsutus Mrtsn 54, 



Fam. Pourtalesiidse 58. 



Pourtalesia Jeffreys! Wyv. Thorns 58, 



— Wandeli Mrtsn 63, 



Echinosigra (Pourtalesia) phiale Wyv. Thorns 68, 



— — paradoxa Mrtsn 72, 



Suborder Amphisternata 90, 



Fam. SpatangidK 90. 



Page 



Aeropsis rostrata (Wyv. Thorns.) go. 



Hemiaster expergitus Loven 97, 



Brisaster (Schizaster) fragilis (Dub. Kor.) 108, 



Spatangus purpureus O. F. Miill 123, 



— Raschi Loven 129, 



Echinocardium flavescens (O. F. Miill.) 132, 



— pennatifidum Norman 139 



— cordatum (Penn.) 145 



Brissopsis lyrifera (Forbes) 152 



Addenda et Corrigenda i6g 



Geographical distribution of the Echinoidea of the Nor- 

 thern Atlantic 177 



List of the Echinoidea occurring in the .Atlantic 192 



Index 195. 



