CONTENTS. 307 

 C. Acanthascinae 127 



Key to tlie genera Irjy 



General organization 128 



Acanthascus F. E. >Sch i;;;) 



Key to the species 140 



A. cactua F. E. SuH 140 



Spiculation 147 



Soft parts 154 



A. cdani Ij 158 



Spiculation KjO 



Stanfocdlyptas Ij Dj^ 



Key to the species 16;; 



6'. rœperi F. E. ScH KJS 



'S', dowlingi (L. M. Lambe) 172 



S, iubulums nov. sp 175 



Spiculation 177 



6'. aßiiis nov. sp ISO 



Spiculation 18-3 



<S'. entacanthus nov. sp ]',)1 



Spiculation 1<J() 



Soft parts 2(10 



S. niicrochetus Ij 202 



Spiculation 20;> 



S. glaber Ij 207 



Spiculation 21;» 



S. heteractinus Ij 21S 



Spiculation 211) 



.y. pleorliaphides Ij 222 



Spiculation 22-1 



I ' udeterni iuable Sl<iuruml[/ptus. 



tS. sp. X 2;m 



Ithabtlocalyptiis F. E. Sen 2:5(5 



Key to the species 2;>() 



11. victor Ij 2;]8 



Spiculation 245 



Soft parts 251 



R. mollis F. E. ScH 25;> 



Spiculation 261 



R. unguieidatus uov. sp 2(i8 



Spiculation 



zi J, 



R. capillalus Ij 27fi 



Spiculation 282 



Soft parts 287 



Diagnoses of the species treated of in tliis Contribution 21)1 



List of literature referred to in tliis Contribution ;jo;', 



N.B. A correction with regard to the generic naiue " I'lacosoma " applied by uic to 



an EuplecLclUd []()b 



