F 
\ 
612 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Cactocrinus clarus Hatt. | 
Plate LVI, Figs. 9 and 10, and Plate LVIIL. Fig. 1. | 
| e 
1861. <Actinocrinus clarus — Haut; Descr. New Spec. Crin. (Prelim. notice), p. 2; also Boston Journ. 
Nat. Hist., Vol. VIL, p. 277; N. Y. State Bull. Nat. Hist. (1872), Plate 3.4, Figs. 24 and 25. 
1881. Actinocrinus clarus —W. and Sp.; Revision Paleocr., Part IT., p. 142. 
1893. Wuuirrrenp; Mem. Am. Mus. Nat. Hist. N. York, Vol. I., p.8, Plate 1, Figs. 4 and 5. 
Larger than any of the preceding species. Calyx once and a half as 
wide as high. Dorsal cup depressed subconical, broadly truncate at the base, 
evenly spreading to the top of the costals, and more abruptly thence to the 
arms. Ventral disk as high as the dorsal cup, somewhat expanded above 
the arm bases, giving to the calyx a top-heavy appearance; the anal tube 
rising gradually from the summit. Plates of the dorsal cup heavy, and ele- 
vated into strong angular nodes, which are either smooth or connected with 
- each other by short, indistinct ridges, except the palmars and post-palmars, 
which are rounded off toward the sides, and separated laterally by deep 
grooves. Suture lines distinctly grooved. 
Basals broad, rarely thickened at the lower margins, and projecting but 
little beyond the column; interbasal sutures well marked. Radials about 
once and a half as large as the costals, as long as wide. First costals con- 
siderably narrower; either quadrangular, pentangular or hexangular, the 
second often larger than the first. Distichals as wide as the costals, but 
shorter. Palmars a little narrower than the distichals, and twice as wide 
as long, their outer plates supporting a single arm, the inner one two 
with post-palmars, except in the two antero-lateral rays, in which only 
one of the palmars is followed by higher brachials. Arm facets large, 
equidistant, and directed horizontally. Arms twenty-eight, biserial from 
their origin, heavy, long, and in close contact; they bend at first outward, 
then gracefully upward, being rounded on the back, and showing no sign of 
flattening or decrease in width to near the tips, where they rapidly taper to 
a fine point. Arm joints arranged in parallel lines, quite short, and without 
ornamentation. Pinnules long, fringe-like, composed of twelve to fourteen 
joints, each one provided with a long, sharply pointed tooth-like projection, 
directed obtusely upward and outward, which overlaps the corresponding 
joint of the next pinnule above, their teeth forming raised lines parallel to 
the sides of the arms. Regular interbrachials: 1, 2, 1; the three lower ones 
