REPORT ON THE ASTEROIDEA. 299 
whilst the outer members of the series are simply truncate papille or elongate granules. 
On the margin of the mouth-plate adjacent to the adambulacral plate is a series of six 
papilliform spinelets or granules similar to the last-mentioned. One or two additional 
spinelets usually stand on the interspace of the plate formed by the divergence of this and 
the median series. 
The paxillee of the abactinal area are of two forms, and present a very ornate appear- 
ance.. Those which occupy the radial portions of the disk are hexagonal, tabulate, and 
well spaced, with a definitely-arranged spinulation ; the covering of the interradial areas, 
on the other hand, consists of square or rhomboid plates compactly placed and covered 
with a small uniform miliary granulation similar to that on the supero-marginal plates. 
The median radial line is oceupied by a longitudinal series of transversely elongate hexa- 
gonal paxillz, which are larger than any of the others. Their transverse diameter is 
2mm., and the longitudinal measurement (corresponding to the direction of the ray) varies 
from 1 to1‘5mm. The margin of the tabulum is occupied by a regularly placed series of 
twenty-two to twenty-five short, prismatic, sharply truncate spinelets, their truncation 
being in conformity with the well-defined, regular and sharply-angular hexagonal outline 
of the paxilla as a whole, which is so regular that these spinelets almost appear as if 
trimmed into form with a knife. The central portion of the tabulum is occupied by seven 
to eighteen semiglobular well-spaced granules, which vary in size according to number, 
but are of uniform size on a given tabulum. When this series of paxille reaches the 
base of the ray proper, they lose their tabulate character and appear more like simple 
hexagonal plates compactly placed, and the marginal series of spinelets lose their 
prismatic character and become rounded granules similar to those on the surface of 
the tabulum, and at the same time the latter increase in number. Towards the end of 
the ray the paxillar plates lose their hexagonal outline and become square, and finally 
become so small that their serial succession is interrupted by the contact of 
the two corresponding supero-marginal plates from each side of the ray. The 
radial series then rapidly aborts, and the extremity of the ray is occupied entirely 
by the supero-marginal plates. On each side of the median radial line of paxille, within 
the area of the disk, are three parallel longitudinal series of similar, but somewhat 
smaller, hexagonal tabulated paxille. The outermost two are confined to the area of the 
disk and terminate at the base of the ray; the innermost, however, is continued a little 
further along the ray, nearly to the middle, but the hexagonal form is altogether lost ; and 
all the plates near the base of the ray and any which proceed along it change the special 
spinulation of the tabulated paxillz for the small miliary granulation similar to that on 
the supero-marginal plates above noticed. The tabulated paxillee of the three series on 
each side of the median row are of the same height and character as the latter, and they 
stand well spaced, so that the star-like prolongations uniting the bases, as well as the 
papulz, are visible. The row of paxille next to the median series have their transverse 
