BATOCRINID 2. 447 
Macrocrinus Konincki (SHvum.). 
Plate XX XV. Figs. 1, 2, 8. 
1855. Actinocrinus Konincki—Suumarp; Geol. Rep. Missouri by Swallow, Part II., p. 194, Plate A, 
Figs. 8a, 3, ¢. 
1873. Batocrinus Konincki — Merk and WortHEN; Geol. Rep. Illinois, Vol. V., p. 367. 
1877. Batocrinus Konincki—S8. A. Mituer; Catal. Amer. Paleeoz. Foss., p. 172. 
1881. Hretmocrinus Konincki —W. and Sp.; Revision Paleocr., Part II., p. 173 (Proceed. Acad. Nat. Sci. 
Phila., p. 347). 
1890. Hretmocrinus Konincki—S8. A. Mitzer; North Amer. Geol. and Pal., p. 243. 
Syn. Actinocrinus urneformis —McCuEsney; 1860, Descr. New Spec. of Foss., p. 23. 
Calyx urn-shaped, small, elongate. Dorsal cup one third higher than the 
ventral disk, constricted at the basi-radial sutures, whence it gradually and 
uniformly expands to the bottom of the arm-bearing brachials, which are 
directed abruptly outward. All plates of the dorsal cup are more or less 
convex; the radials, anal plate, and first interbrachials strongly nodose. 
Base rather high, wider at the lower end than at the upper ; the bottom 
truncated and hexangular in outline; interbasal sutures indistinct; the col- 
umn facet bordered by a small circular ridge. Radials large, as long as wide. 
The two costals together not more than half the size of the radials; the 
first as long as wide, or nearly so, and quadrangular; the second larger, 
more convex, and pentangular. The three anterior rays have 3 X 2 dis- 
tichals and two arms; the two posterior rays toward the anal side but one 
distichal, followed by 2 X 2 palmars, at the opposite side three successive dis- 
tichals. The two upper rows of brachials in the calyx are connected later- 
ally except at the anal side, where one or two small plates are interposed 
between them. Arm facets small; the ambulacral openings slightly grouped ; 
the space between the posterior rays wider than between the others, and 
somewhat depressed. Respiratory pores arranged interradially; they con- 
sist of five pairs, are very large, and are located on a level with the ambu- 
lacral openings. Arms twelve, biserial, of moderate length, the tips infolding; 
they are slender, slightly flattened on the back, and composed of short, nar- 
row, transverse pieces. There is but one interbrachial at the four regular 
sides, but four to six in the anal interradius. The anal plate is higher than 
the radials, and followed by three large nodose plates, and by one, two, or 
three in the next row. Ventral disk irregularly conical, the posterior oral 
pushed anteriorly, very large and more elevated than any of the other 
plates. Anal tube almost central, and composed of large, nodose pieces ; it 
