BY F. JEFFREY BELL, M.A., SEC. R.M.S. 501 



Ophiocoma erinaceus. The differences between this and 0. 

 scolopendrina have been very acutely detected by Mr. Lyman. 

 (See his Challenger Report. S. V.) 



Ophiothrix ccespitosa. This species is perhaps very variable, 

 but the genus Ophiothrix will need the unreserved labour of many 

 years before we can even hope to have its species satisfactorily 

 mai-shalled. I would particularly direct the attention of the Aus- 

 tralian naturalists to the constancy, variability, and patterns of the 

 colour-markings of the species of this genus. 



Class. Echnoidea 



1. Phyllacanthus imperialis. 



" Australian Coast." 



2. P. tenuiispinus. 



Port Jackson. Vide infra. 



3. Phyllacanthus, sp. 



Port Jackson. Vide infra. 



4. Goniocidaris geranioides. 



S. E. Australia. 



5. Goniocidaris tubaria. 



Port Jackson — 5 fms. 



6. Diadema setosum. 



Port Denison. 



7. Centrostephanus rodgersii. (Young.) 



Port Jackson. 



8. Echinothrix calamaria. 



Solomon Islands. 



9. Salmacis alexandri. Vide infra. 



Port Jackson, Sow and Pig's Reef. 



