CONTENTS. 



Echinoidea. 



Page 



Introduction I 



On generic and specific Characters in the Echinoids . . . 3 



Fam. Cidaridie II 



Diagnoses of the genera of the Fam. Cidaridae 28 



Dorocidaris papillata (Eeske) 31 



Cidaris affinis Phil 35 



Stereocidaris ingolfiana 11. sp 3S 



Porocidaris purpurata Wyv. Thomson 41 



Table of the Cidarids occurring in the northern Atlantic 



and the Mediterranean 42 



Fam. Echiuothurida.* . . 43. 



Diagnoses of the genera of the Fam. Echinothuridae. ... 62 



Phormosoma placenta Wyv. Thomson 66 



Calveria hystrix Wvv. Thomson . 70. 



Arseosoma fenestratum (Wvv. Thomson I 72. 



Sperosoma Grimaldii Koehler 75 



Tromikosoma Koehleri n. g., u. sp 7S 



Table of the Echinothurids occurring in the northern 



Atlantic So. 



Fam. Temnopleuridae 



Hypsiechinus coronatus n. g., n. sp. 



S6 



l'a^e 

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



echmidae A. Agass 90. 



Diagnoses of the Fam. Stomopneustidas, Echinidae, Toxo- 

 pneustidae and Echinonietridse, with their subfamilies 



and Genera 133. 



Fam. Echinidas 141. 



Subfam. Parechiniuae 141. 



Parechinus miliaris (Mull.) 141 . 



Subfam. Echininae 142. 



Echinus elegans Dub. Kor 142. 



— Alexandri Dan. Kor. 146. 



— affinis n. sp 150. 



— acutus Lamk 152. 



— esculentus L 160. 



Fam. Toxopneustidae 162. 



Subfam. Strongyloceutrotinae 162. 



Strougylocentrotus drobachieusis 162. 



Table of the Echinids of the Families Echinidse and Toxo- 

 pneustidae occurring in the northern Atlantic and the 



Mediterranean 165. 



Appendix 169. 



Bibliography 1S3. 



4190 





