CONTENTS. 



Echinoidea. 



Page 



Introductioii i. 



On <;eneric and specific Characters in tlie Echinoids. ... 3. 



Fani. Cidaridæ 11. 



Diagnoses of the genera of the Fam. Cidaridæ 28. 



Dorocidaris papillata (Leske) 31. 



Cidaris affinis Phil 35. 



Stereocidaris ingolfiana n. sp 38. 



Porocidaris purpurata Wyv. Thomson 41. 



Table of the Cidarids occnrring in the nortiiern Atlantic 



and the Mediterranean 42. 



Fam. Echinothuridæ 43. 



Diagnoses of the genera of the Fam. Echinothuridæ.... 62. 



Phormosoma placenta Wyv. Thomson 66. 



Calveria hystrix Wyv. Thomson 70. 



Aræosoma fenestratum (Wyv. Thomson) 72. 



Sperosoma Grimaldii Koehler 75. 



Tromikosoma Koehleri n. g., n. sp 78. 



Table of the Echinothnrids occurring in the northern 



Atlantic So. 



Fam. Temnopleuridæ Si. 



Hypsiechinus coronatus n. g., n. .sp 86. 



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

 echinidæ A. Agass 



Diagnoses of the Fam. Stomopneustidæ, Echinidæ, Toxo- 

 pneustidæ and Echinometridæ, with tlieir subfamilies 

 and Genera 



Fam. Echinidæ 



Subfam. Parechiniuæ 



Parechinus miliaris (Miill.) 



Subfam. Echininæ 



Echinus elegans Diib. Kor 



— Alexandri Dan. Kor. 



— affinis n. sp 



— acutus Lamk 



— esculentus L- 



Fam. Toxopneustidæ 



Subfam. Strongj-locentrotinæ 



Strongylocentrotus drobachiensis 



Table of the Echinids of the Families Echinidæ and Toxo- 

 pneustidæ occurring in the northern Atlantic and the 

 Mediterranean 



Appendix 



Bibliographv . 



I'a^e 

 90. 



133- 



141. 



141. 



141. 



142. 



142. 



146. 



150. 



152 



160. 



162. 



162. 



162. 



165. 

 i6g. 

 183. 



