CONTENTS. 



Echinoidea. 



Page 



Introduction 3. 



Suborder Clypeastroidea 28. 



Fam. Fibulariidae 28. 



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



Suborder Meridosternata 39. 



Fam. Urechinidae 39. 



Urechinus naresianus A. Ag 39. 



Plexechinus hirsutus Mrtsn 54. 



Fam. Pourtalesiidae 58. 



Pourtalesia Jeffreys! Wyv. Thorns 58. 



Wandeli Mrtsn 63. 



Echinosigra (Pourtalesia) phiale Wyv. Thorns 68. 



paradoxa Mrtsn 72. 



Suborder Arnphisternata 90. 



Fam. Spatangidse 90. 



Page 



Ae'ropsis rostrata (Wyv. Thorns.) 90. 



Hemiaster expergitus Loven 97. 



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



Spatangus purpureus O. F. Miill 123. 



Raschi Loven 129. 



Echinocardium flavescens (O. F. Mull.) 132. 



pennatifidum Norman 139 . 



cordatum (Penn.) 145. 



Brissopsis lyrifera (Forbes) . . / 152. 



Addenda et Corrigenda 169. 



Geographical distribution of the Echinoidea of the Nor- 

 thern Atlantic 177. 



List of the Echinoidea occurring in the Atlantic 192. 



Index . . . . 195. 



173412 



