CONTENTS. 



Echinoidea. 



Page 



Introduction 3 



Suborder Clypeastroidea 28 



Fani. Fibulariids 28 



Echinocyamus pusillus (O. F. Mull.) 28 



Suborder Meridosternata 39, 



Fam. Urechimdae 39. 



Urechinus naresianus A. Ag 39. 



Plexechinus hirsutus Mrtsu 54 



Fain. Pourtalesiidae 58 



Pourtalesia Jeffreysi Wyv. Thorns 58. 



Wandeli Mrtsn 63 



Echinosigra (Pourtalesia] phiale Wyv. Thorns 68 



paradoxa Mrtsn 72 



Suborder Amphisternata 90. 



Fain. Spatangidae 90 



Page 



Aeropsis rostrata (Wyv. Thoms.) 90, 



Hemiaster expergitus Loven 97 



Brisaster (Schizaster) fragilis (Dub. Kor.) 10S 



Spatangus purpureus O. F. Mull 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 



4191' 



-^Y 



