SEA LILIES, STARFISHES, ETC.—CLARK. 45, 
and 3 mm. thick), to within 15-20 mm. of the centre of the 
disk ; distally these plates are much like the other abactinal 
plates and are about 2 mm. in diameter ; near the middle of 
the arm and proximal to it they become compressed and 
are much wider than long (3-4 mm. wide by 1.5-2 mm. long), 
but the 4-6 most proximal are again more or less nearly circular 3. 
these circular proximal plates are the largest of the disk and 
are very much swollen ; the most proximal, which is largest, 
is 5-6 mm. in diameter and 3 mm. or more high ; on these big 
proximal plates, the central granule becomes developed into 
a huge spine, 2 mm. in diameter; only one of these persists 
in the specimen at hand ; that is on the fourth plate of one of 
the radial series and measures 3 mm. in height. |The median 
radial plates are accompanied nearly, and sometimes quite, 
to the terminal plate, by a series of similar, but smaller and 
less conspicuous plates, without spines. At the centre of the 
disk, and in each interradius, in line with the most proximal 
of the big radial plates, are enlarged plates, which apparently 
bore spines. The circular madreporite, 4 mm. across, lies. 
just distal to one of these large interradial plates. 
Superomarginal plates 25-26 on each side of each ray, more 
or less bare and smooth, and distinctly swollen ; each plate is 
surrounded by a series of flattened granules ; the plates in the 
interbrachial arc bear a vertically elongated cluster of spherical 
granules, among the lower onesa stout spine ; on the first supero- 
marginal (adjoining the interradial line), this spine is about 
6 mm. long and a millimeter thick at base ; each succeeding 
plate has fewer granules, and the spine becomes stouter and 
stands nearer to the centre of the plate ; at the middle of the 
arm, the spine may be 2 mm. in diameter and there are 
virtually no granules on the plate ; distally the spines become 
steadily smaller ; in the present specimen none are left distal 
to middle of arm; occasionally one, or even two, of the 
granules on the plate are replaced by the big, characteristic 
pedicellariz. Inferomarginal plates one more in number than: 
the superomarginals and hence not corresponding exactly in 
position, except at each end of the series; very similar in 
appearance but with more granules (especially at oral end, in 
interradial arc) and (to judge from the single one remaining) 
with more slender spines. 
Actinolateral plates wanting on distal half of ray; the first 
series (adjoining adambulacrals) begins at about the ninth, 
or eighth, inferomarginal (counting from interradial line) ; 
the second series begins at the third inferomarginal and a 
third series at the second; the rest of the large actinal area is: 
