REPORT ON THE ASTEROIDEA. FES 
3. Pseudarchaster intermedius, n. sp. (Pl. XIX. figs. 3 and 4; Pl, XLII. fis. 5 and 6). 
Rays five R=35mm.; 7r=llmm. R>3r. 
Rays moderately long, tapering continuously from the base to a finely pointed 
extremity; breadth midway between the centre of the disk and the extremity, 6°5 mm. 
Interbrachial arcs well-rounded. 
The paxille of the abactinal area are rather small, subcircular, and closely placed, 
surmounted by ten to fifteen short, truncate, polygonal spinelets, two or three central ones 
usually larger than the rest, but these are irregular in disposition, and smaller ones may 
appear at the periphery and increase the difficulty of enumerating the spinelets. The 
paxille are disposed in regular longitudinal lines along the ray, a median radial series being 
clearly distinguishable and slightly larger than the others. The primary embryonic plates 
are discernible, though not much larger than the neighbouring plates external to them. 
The paxille diminish slightly in size as they approach the margin and proceed along the 
ray. A considerable number of smaller paxillze occupy the area within the circle of the 
primary basal plates, and the dorso-central plate is small and inconspicuous. The madre- 
poriform body is small and sunken, and lies external to its adjacent primary basal plate. 
The marginal plates form a well-rounded lateral wall, the curvature of the inferior 
series being slightly fuller or more tumid than that of the superior series, The supero- 
marginal plates are thirty-two in number from the median interradial line to the extremity. 
The height of the plates in proportion to their length is greatest in the interbrachial 
arc ; and the breadth of the marginal border as seen from above is also rather broader 
in the interbrachial are. Midway along the ray it is nearly equal to the breadth of 
the intermediate paxillar area. The supero-marginal plates bear no spines, but are covered 
with a low, truncate, closely packed polygonal granulation. The granules are largest 
near the summit of the are of curvature; and the plates are slightly tumid along their 
median line, transverse to the axis of the ray. The odd terminal plate is of a rounded 
shield-shape, and subtubercular in appearance. 
The infero-marginal plates correspond to the superior series; their covering, how- 
ever, is distinctly squamiform, except at the extreme margins, where the granules at the 
outer end of the plate partake of the character of those of the adjacent supero-marginal 
plates, whilst those at the inner end form a transition to the granules of the actinal 
intermediate plates. Some of the squamules on each plate are more elongate and 
spiniform than the rest, but the definite line of small pointed adpressed spines noticed in 
Pseudarchaster tessellatus and Pseudurchaster discus is wanting in the present species. 
The armature of the adambulacral plates consists of a furrow series of five spines, 
their base line forming an acute angle into the furrow. They are moderately long and 
thickened towards the extremity, which, in the case of the middle spine, is more or less 
flattened in the direction transverse to the axis of the ray, but in the other spines in the 
direction of the margin of the plate to which they are attached. External to the furrow 
