394 PROF. F. JEPFEET BELL OJf 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 himselt as though the motto of his science \^ere 

 " 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 (enigma 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 JEchinoclerms of North-west Australia ^. 



I. HOLOTHUEIOIDEA. 



Observed range in depth. 



Colochirus tiibereulosus, Semper 15-3(i t'ms. 



Actinocucumis typica, Ludwig 15-20 „ 



II. CKIIS'OIDEA. 



Antedon milberti, Miiller 8-15 fms, 



„ serripinna, P. H. C. 24-39 ,, 



Tariipinna, P. Zf. C. 9-38 „ 



„ sp. (near raacwMema) ? 



Actinometra pectinata, Betz 20-36 „ 



,, nobilis, P. i/^ C. 65 „ 



„ paucicirra, -Sci/ 8-15 „ 



„ parvicirra, P. H. C. D „ 



„ variabilis, Bell !*. 9-38 ,, 



„ nuiltifida, Midler ? 



„ muliiradiata, L ? 



III. ASTEEOIDEA. 



Astropecten polyacantbus, M. Tr 32-34 fms. 



„ schoenleini, M. Tr ? 



„ zebra, Sluden B-Sfi ,, 



Luidia hardwickii, Gray 3(j ,, 



„ aspera?, jS7rtc/c» 15-38 „ 



Iconaster longimanuB, ilfo6i«s 15-38 ,, 



Stellaster incei, Gray 8-34 „ 



Pentaceros nodulosus, Perw'cr 15 „ 



Culcita pentangularis, Gray ? 



Opbidiaster helicostiehus, Sladen 15-24 „ 



Linckia marmorala, iV//c/(e/MJ 15-22 ,, 



,, megaloplax, &/^ 15-24 ,, 



Nardoa tuberculata, Gray 9-38 ,, 



Metrodira subulata, Gray 39 ,, 



Ecbinaster purpureus, Gray 8-15 „ 



IV. OPHIUROIDEA. 



Pectinura inegaloplax, JSe/Z ? 



„ sphenisci 15 fms. 



* The chief localities are Holothuria Bank, Magnetic Shoal, Cossack Island ; 

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



