’ 
38 ‘“ ENDEAVOUR” SCIENTIFIC RESULTS. 
a series of 2 or 3, and then a single plate, against the infero- 
marginals, completes the covering of the area ; all these plates 
tend to overlap inwardly and proximally ; all are bearers 
of granules like those on the inferomarginal plates. Adambu- 
lacral plates about 40, at first wider than long, but rapidly 
decreasing in breadth and becoming twice as long as wide - 
distal to middle of arm there are about 7 adambulacrals to 
about 5 inferomarginals ; the furrow margin is at first nearly 
straight, but soon becomes convex and then the convexity 
becomes more and definitely restricted to the adoral end ; 
distal to the middle of the arm, these convexities on plates of 
opposite sides tend to meet across the furrow, the bridges 
thus formed alternating with conspicuous pores where the 
plates are not in contact ; proximally there are 6 or 7 blunt, 
somewhat angular, more or less flattened spines, about half a 
millimeter long on the furrow margin of each plate; the 
middle spines are longest, the proximal and distal shortest ; 
on the plates distal to arm-middle there may be 8 or 
9 spines in the series, but they are decidedly shorter ; 
outside the marginal series is a parallel set of 3-5 much 
smaller, thicker spines or high granules, and external 
to it a parallel series of 5-6 granules like those on the 
actinal plates ; additional similar granules may occur between 
the two external series or outside the outer one ; the adambu- 
lacrals may thus be about as well covered with granules as 
any of the actinal plates. Oral plates neither conspicuous nor 
peculiar, only the proximal spines enlarged and they not very 
greatly. Pedicellarize none. Colour gray, more yellow 
beneath ; nearly white where the granules are rubbed off. 
The markedly pentagonal abactinal area, the flat and over- 
hanging interradial superomarginals, the adambulacral arma- 
ture and the general proportions remind one very strongly of 
N. albidus, from the tropical Atlantic, but the adambulacral 
spines are angular and flattened in the Australian species and 
eight superomarginal plates, instead of six, make up the disk 
boundary on each side. None of the species from the Indian 
Ocean and Philippine Islands seem to be any nearer than 
N. albidus to this South Australian species. 
Loc.—Great Australian Bight, 129° 28’ E., 250-450 fathoms. 
One specimen. 
