HEX ACRINIDE. 767 
Basal cup about two thirds as high as the radials; the salient angles 
obtuse and the intervening spaces very little concave; column facet small. 
Radials from one third to one half longer than wide; irregular in form, some 
of them much wider above than below, others of nearly equal width through- 
; out; the upper faces distinctly sloping at the sides, forming rather deep 
notches for the reception of the interbrachials; facets but slightly excavated, 
occupying a little more than one third the width of the plates. Anal plate 
generally narrower than the radials. Costals two, comparatively large, 
supporting two simple arms, which from the third or fourth plate up are | 
composed of two series of transverse pieces alternately arranged. The arms 
are heavy throughout, biserial, and rounded on the back. Pinnules cylin- | 
drical, very long and stout. All other parts unknown. 
Florizon and Locality. — Kaskaskia group; Pulaski Co., Ky., and Hunts. | 
ville, Ala. | 
Type in the collection of Wachsmuth and Springer. 
fiemarks. — The form of the calyx, thickness of plates, deep notches for 
the reception of the interradials, and the stoutness of the arms, are characters 
which distinguish this species readily from D. delicatus. 
Dichocrinus scitulus Hatt. 
Plate LX XVIII. Figs. 18a, 6, and 14. | 
1861. Hat; Journ. Bost. Soc. Nat. Hist., p. 289. 
1872. Hatt; N. Y. State Museum Nat. Hist., Bull. I., Plate 24, Figs. 12 and 18. 
1881, W. and Sp.; Revision Paleocr., Part II., p. 84. ; 
Syn. Dichocrinus pocillum Hatt, 1861; Journ. Bost. Soc. Nat. Hist., p. 291; figured Bull. I. N. Y. 
State Mus. Nat. Hist., Plate 24, Figs. 16 and 17 (not 14 = D. levis). 
Larger than the two preceding species, the calyx more conical, the radials 
comparatively shorter. Calyx obconical, less rapidly spreading at the radials 
than along the basals. Plates thin; their surface smooth or finely corrugated. 
Basal cup nearly one half the height of the calyx to the arm bases; 
column facet small, circular, slightly projecting. Radials a little wider than 
long, narrowest at the lower end, the upper face but little sloping at the j 
sides ; somewhat elevated longitudinally in the middle, forming an obscure | 
ridge, which disappears before reaching the basals; facets semi-circular, nav- 
row, occupying less than one-third the width of the plates at the top. 
Costals small, bending outward; the first very short, linear; the second 
depressed pentagonal, sharply angular at the top. Distichals divergent, as 
long as wide, and almost as wide as the costals; the second one axillary, 
