CONTENTS. 



Echinoidea. 



Introduction 



On generic and specific Characters in the Echinoids .... 



Fain. Cidaridie 



Diagnoses of the genera of the Fam. Cidaridse 



Dorocidaris papillata (Leske) 



Cidaris affinis Phil 



Stereocidaris ingolfiana n. sp 



Porocidaris purpurata Wyv. Thomson 



Table of the Cidarids occurring in the northern Atlantic 



and the Mediterranean 



Fain. Echinothuridse 



Diagnoses of the genera of the Fain. Echinothuridae. . . . 



Phormosoma placenta Wyv. Thomson 



Calveria hystrix Wyv. Thomson 



Araeosoma fenestratum (Wyv. Thomson) 



Sperosoma Griinaldii Koehler 



Troinikosoma Koehleri n. g., n. sp 



Table of the Echinothurids occurring in the northern 



Atlantic 



Fain. Tetnnopleuridic 



Ilypsiechinus coronatus n. g., n. sp 



Page 

 I. 



3- 

 II. 

 28. 



31- 

 35- 

 38. 

 41. 



42. 



43- 

 62. 

 66. 

 70. 

 72. 



75- 

 78. 



80. 

 81. 

 86. 



On the Fam. Echinometradae Gray and the Subfam. Tripl- 



echinidae A. Agass 



Diagnoses of the Fam. Stomopneustidae, Echinidae, Toxo- 

 pneustidae and Echinometridse, with their subfamilies 



and Genera 



Fam. Echinidae 



Subfam. Parechininae 



Parechinus miliaris (Mull.) 



Subfam. Echininae 



Echinus elegans Dub. Kor 



Alexandri Dan. Kor 



affinis n. sp 



acutus Lamk 



esculentus L 



Fam. Toxopneustidse 



Subfam. Strongylocentrotinse 



Strongylocentrotus drobachiensis 



Table of the Echinids of the Families Echiuidae and Toxo- 

 pneustidae occurring in the northern Atlantic and the 



Mediterranean 



Appendix 



Bibliography 



Page 



90. 



133- 

 141. 

 141. 

 141. 

 142. 

 142. 

 146. 

 150. 

 152. 

 1 60. 

 162. 

 162. 

 162. 



165. 

 169. 

 183. 



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