394 PROF. F. JEFFREY BELL OX THE [May 1 , 



fixity of tenure in zoology, no certainty that the doctrines accepted 

 to-day will not be derided to-morrow ; most men of science see 

 this and act accordingly ; the systematic specialist is apt to forget 

 it, and to bear himself as though the motto of his science were 

 " Quod semper, quod ubique, quod ab omnibus." 



I cannot but hope that the description I have given of the very 

 remarkable Ophiuroid which I have called Ophiocrene cenigma will 

 result in the search for more, and perhaps more fully matured, 

 specimens ; it is a matter of regret that the material is not 

 sufficient to allow of a complete judgment as to the systematic 

 position of what all will allow to be a very remarkable form. 



A. — List of Echinoderms of North-tvest Australia l . 



I. HOLOTIIURIOIDEA. 



Observed range in depth. 



Colochirus tuberculosus, Semper 15-36 fins. 



Actinocucuuiis typica, Ludwig 15-20 „ 



II. CEJXOIDEA. 



Antedon milberti, Midler 8-15 fms. 



,, serripinna, P. H. C. 24-39 ,, 



„ variipinna, P. H. C. 9-38 „ 



,, sp. (near macronenta) ? 



Actinometra pectinata, Rets 20-36 „ 



nohUis, P. H. C. 65 „ 



„ paucicirra, Bell 8-15 ,, 



„ parvicirra, P. H. C. „ 



„ variabilis, Bett 9-38 „ 



„ multifida, Matter ? 



„ multiradiata, L ? 



III. ASTEKOIDEA. 



Astropecten polyacantbus, M. Tr 32-34 fms. 



„ Bchoenleini, M. Tr ? 



„ zebra, Bladen 8-36 „ 



Luidia bardwickii. Gray 36 „ 



„ aspera?, Sladen 15-38 „ 



Tconaster longimanus, Mobiiis 15-38 ,, 



Stellaster incei, Gray 8-34 „ 



Pentaceros nodulosus, Perrier 15 „ 



Culcita pentangularis, Gray ? 



Opbidiaster helicostic-bus, Sladen 15-24 „ 



Linckia marmorata, Micheliu 15-22 ,, 



„ rnegaloplax, Bell 15-24 „ 



Nardoa tuberculata, Gray 9-38 „ 



Metrodira subulata, Gray 39 ,, 



Ecbinaster purpureas, Gray 8-15 „ 



IV. OPHIUROIDEA. 



Pectinura raegaloplas, Bell ? 



„ sphenisci 15 fins. 



1 Tbe cbief localities are Holothuria Bank, ilagnetic Shoal, Cossack Island • 

 and Baudin Island (14° 8' S., 125° 36' E.). 



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