ECHINODERMS FROM WEST ADSTEALIA. 237 
Actinolateral areas small; along the mid-interradial lines there are a'feout 
six series o£ actinolateral plates, but the outermost consists of only one or two 
plates, the next two are little longer, the next is perhaps 10 mm. long, the 
second series does not quite reach the middle of the ray and the first extends 
far out, almost to the tip of the ray ; all these plates are covered by coarse 
prismatic granules, much coarser than those of the abactinal surface ; the 
largest and most prismatic granules are nearest the oral plates. 
Adambulacral plates more than 50, the distalmost hard to distinguish ; 
they form a slight undulating margin to the furrow ; each plate carries 
3 furrow spines (distally only 2), which are subequal, not notably prismatic, 
blunt, and slightly thicker at tip than at base ; distally, as a rule, the 
adoral is the smaller of the two; near the base of the arm the spinelets are 
about 2 mm. long, and 'SO-'TO mm. thick at tip. On the surface of each 
adambulacral plate are 3-5 very short, thick, and prismatic spines ; the two 
largest of these adjoin the furrow spines, while the remaining 1-3 are near 
and resemble the prismatic granules on the first series of acitinolaterals. 
Oral plates not conspicuous or peculiar ; even the oral spines are no larger 
than those on the adjoining adambulacrals. No pedicellarise were seen 
anywhere. 
Colour light yellowish-gre}'. 
There are two specimens of this interesting new Nectria, collected along 
the shore in the " Pelsart group " ; one label says " Pelsart Island." The 
interbrauchial septa are calcified, and the general appearance is so much like 
Nectria that there can be little question of the generic position. And yet the 
abactinal plates are much less paxilliform, and are much more crowded on 
the disk and arm-bases than in the other members of the genus. The disk 
is also very distinctly smaller, and the arms are narrower at base, wider at 
tip, and more nearly cylindrical than in either N. ocellata or N. ocelli/era. 
The granulation of the actinal plates, especially at the base of the arms, is 
noticeably prismatic in iV. macrobrachia, and that of the abactinal plates at 
the tips of the rays is coarse, crowded, and prismatic ; these differences in 
granulation, which seem trivial when put into words, are very conspicuous 
when specimens are compared. 
The paratype of N. macrohracJiia is a badly injured individual, much 
smaller than the one described. There are but three rays ; two, side by side, 
seem to have been bitten off very close to the disk, apparently at different 
times, as they show different degrees of healing. The rays present are 
strongly curved and contracted, but apparently R = 42 mm. and r=ll, so 
that R is almost 4 r. The granulation and colour are exactly the same as in 
the holotype. The armature of the adambulacral plates is also similar, but 
the number of furrow spines is not reduced to two until 'almost the very tip 
of the arm is reached. 
