ACTINOCRINID.&. 565 
radials, first costals and anal plate are transversely elongate, and occupy 
nearly one fourth the surface of the plates; while those upon the inter- 
brachials, which have a circular outline, are proportionally smaller. There 
are generally three ridges between the radials, basals and costals, but these 
are not continuous, extending only to the margins of the nodes; two proceed 
to the first interbrachials, while the other plates up to the brachial extensions 
are connected by single rows. Suture lines distinct. 
Basals large, forming a broad and deep cup, which at its lower margin is 
distinctly notched; the lower edges of the plates expanding, and forming 
a smooth, thickened, trilobate rim, which stands out conspicuously from the 
column. Radials as wide as long — in very large specimens proportionally 
longer — more than twice as large as both costals together; the lateral 
faces longer than the sloping upper ones, First costals nearly as wide as 
long, and hexangular; the second very short, sometimes less than half the 
length of the first, and. obliquely angular above. Distichals small, all axil- 
lary, giving off from one side an arm, which is free and biserial from the 
second plate, and generally simple throughout; from the other side three 
palmars, which support two arms, which both bifurcate once or twice in their 
free state at some distance from the calyx. Arms long, moderately heavy, 
rounded on the back, and nearly as thick at the distal end as at the proximal. 
Arm joints short and shghtly convex. Pinnules rather thin, and only their 
three or four proximal joints are provided with small hooks. Interbrachials: 
1, 2, 3, followed by a number of others in the equatorial region; the first as 
large as the first costals, those of the second and third rows smaller. Anal 
plate somewhat shorter than the radials; supporting two plates in the first, 
three in the second, and four to five in the third row. Tegmen composed 
of slightly convex, moderately large pieces. Orals in contact, the posterior 
one small and placed transversely; the others larger than any of the sur- 
rounding plates, but otherwise not distinct; they are elongate, and narrowest 
at the lower end, leaving notches, which enclose the first radial dome plate. 
The latter is followed by two plates of a second order, and these by alternate 
rows of minute covering pieces. Anal tube extremely long, extending far 
out above the tips of the arms, and heavy throughout; the plates strongly 
tuberculous and sharply pointed at the top, some of them larger and sub- 
spinous. Column large at the upper end, but tapering distinctly downward. 
The nodal joimts near the calyx considerably longer and wider than the 
intervening ones, and angular at the edges, but gradually with their decrease 
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