BATOCRINIDiE. 447 



Macrocrinus Konincki (Shum.). 

 Plate XXXV. Figs. 1, 2, 3. 



1855. Acthwcrimis Konincki — Shumakb ; Geol. Rep. Missouri bj Swallow, Part II., p. 194, Plate A, 



Figs. 8ff, b, c. 

 1873. Batocriiius Konincki — Meek and Worthen ; Geol. Rep. Illinois, Vol. V., p. 367. 

 1877. Batocriiius KonincJci — S. A. Muler; Catal. Amer. Palteoz. Foss., p. 172. 

 1881. Erelmocrinus Konincki — W. and Sp. ; Eevisiou Paleeocr., Part II., p. 173 (Proceed. Acad. Nat. Sci. 



Pbila., p. 3i7). 

 1890. Kretmocrinus Konincki — S. A. Milleb; North Amer. Geol. and Pal., p. 2i3. 



Syn. Actinocriniis ur/iis/onnis — 'McCresn^y ; 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 tirst 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. Eadials 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 quadrangidar ; the second larger, 

 more convex, and pentangular. The three anterior rays have 3X2 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 other.?, 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 



