BATOCRINIDZ. B10 
lary distichal supports 2X4 palmars. The arm-bearing plates are very 
prominent, being separated by deep notches, which give to the rim, as seen 
in a dorsal or ventral aspect, a strongly dentate outline. Arm openings 
almost equidistant, directed upward. Arms eighteen, their structure not 
known. Interbrachials three; the first large, a little wider than long, the 
two upper ones small. Anal plate somewhat narrower than the radials, fol- 
lowed by three plates, of which the middle one is considerably the largest, 
and these apparently by three smaller ones. Disk nearly as high as the 
dorsal cup, the sides but very slightly convex; composed of moderately 
large, conical plates, among which the orals are readily recognized by their 
larger size. Anal tube almost central and of moderate size. 
Horizon and Locality. — Base of the Lower Burlington limestone ; 
Louisiana, Mo. 
Types in the collection of Prof. Rowley. 
fiemarks. — We regard this species as representing a transition toward 
Lobocrinus and Hretmocrinus, and we should not be surprised if it had paddle- 
shaped arms. It resembles in general form Lobocrinus equibrachiatus, espe- 
cially the larger specimens, in which the arms show a tendency to grouping 
into pairs ; but the interbrachials are arched by the palmars — or distichals at 
the anterior side —and consist of but three plates, The species should also 
be compared with Eretmocrinus clio Hall. 
Batocrinus turbinatus (Hatt). 
Plate XX VII. Figs. 5a, 6, ¢. 
1858. Actinocrinus turbinatus — Hai; Geol. Rep. Iowa, Vol. I., Part IL., p. 587, Plate 11, Fig. 1. 
1873. Batocrinus turbinatus —Mxrnx and Wortunn; Geol. Rep. Illinois, Vol. V., p. 367. 
1881. Batocrinus turbinatus —W. and Sr.; Revision Paleocr., Part II., p. 168. 
Syn. Batocrinus letus MILLER and GuruEY, 1894; Geol. Surv. Ilinois, Bull. 3, p. 24, Plate 5, Figs. 
AMG, Jey ee 
Calyx to the base of the anal tube generally as wide as high; the dorsal 
cup one third higher than the ventral disk. Sides but very little concave, 
straight from the bottom of the basals to the plates supporting the free 
arms ; the latter plates projecting. Plates throughout the dorsal cup almost 
flat, their surfaces smooth ; the suture lines indistinctly grooved. 
Basal cup somewhat obconical, sometimes slightly thickened ; lower face 
concave and projecting over the column. Radials large, once and a half as 
wide as long, the upper face distinctly concave. First costals transversely 
