The sub-radial pieces are somewhat regularly — 
little higher than wide, ion laie than the basal pieces, tumid, 
marked above, on either side, by a broad, obscure ridge, hick 
crosses the sutures to unite with similar ones on the lower part of 
the radial plates. 
The radial plates alternate with the last, and amount to 5 sat : 
in each row, the sh number being from 25 to 27. The 
radials are pentagonal, about one-third wider pods high, and their 
upper edges wide. The 2d, 3d, and 4th radials have the width of 
the Ist radials, but they are very short, slightly convex, and quad- 
rangular; the 5th is pentagonal, very short, and supports on its 
upper oblique edges aa rows of brachial pieces, of which there 
are 5 in each row, 4 of them being quadrangular, transverse, and 
consisting of a number of small quadrangular pieces, in a single 
series extending to the summit; the ray reposing on the inner 
is several times bifurcated. 
The anal pieces amount to 8 or 10 innumber. The Ist, wheel 
rests on the base, is heptagonal, with sides nearly equal, rather 
tumid, and somewhat larger than the sub-radial pieces. It bears 
on its upper, straight edge a smaller hexagonal yore, which sup- 
ports two pieces of unequal size, one hexagonal, the other see 
gate quadrangular and very small. These —— are succee 
by several smaller pieces which are variable in f 
“ogi number of ultimate rays is from aa to 50. 
— Column.—A small fragment, only, of the column is known 
“inate of iterits meses! thick and thin pegs the supe- 
e pentagona nal, the o vont — 
