SEA LILIES, STARFISHES, ETC. — CLARK. 



7a 



where so far as I can discover, in which particular this speci- 

 men agrees with individuals from Westernport, Victoria. 



Loc. — Sanders Bank, Kangaroo Island, South Australia, 

 28 fathoms. 



CosciNASTERiAS DUBiA, H: L. Clark. 

 (Plate XXX., flg. 1-2; Fig. 11.) 



Coscinasterias dubia, H. L. Clark, Mem. Austr. Mus., iv., 

 11, 1909, p. 532. 



This is a much better series of specimens than those col- 

 lected by the " Thetis " on which the species was based. 

 They are as a rule very well preserved and range in size from 

 R=22 mm. to R = 138 mm. The pedicellariae are much more 

 numerous, particularly along the ambulacral furrow, than in 

 the " Thetis " specimens, and the membrane connecting the 

 marginal spines is not distinguishable ; it is probable that its 

 conspicuousness in the " Thetis " specimens was due to their 

 poor preservation. The second series of actinolateral spines 

 is often provided with wreaths of pedicellariae. As growth 

 changes, one notes that in the smallest specimen while there 

 are 5 fairly well-marked series of plates on the abactinal 

 surface, above the inferomarginals, half or more of the supero- 

 marginals carry no spines ; there is only one series of actino- 

 lateral spines and this is confined to the basal haK of the arm ; 

 the inferomarginal spines are relatively long and narrow, not 

 at all widened at the tip ; large pedicellarise are relatively 

 few and are virtually wanting along the ambulacral furrow. 



Fig. ll.xlS. 



In the largest specimen, on the other hand, one notes that 

 while all the superomarginals carry conspicuous spines, there 



