BATOCRINID &. 373 
convex; the suture lines grooved. Basals short, thickened around their 
lower margins, and slightly excavated for the attachment of the column. 
Radials a little wider than long, concave at the upper face. Costals com- 
paratively larger than in the preceding species; quadrangular and pentangu- 
lar; the second wider than the first. Distichals two (except toward the anal 
side); the upper wider than the costal axillary ; followed by two palmars, of 
which the second is the larger. Toward the anal side there is but one dis- 
tichal, and the second palmar at the outer divisions of the rays supports two 
post-palmars, but only one at the inner side, making five arms to each of the 
posterior rays. Arm openings arranged at nearly equal distances; directed 
horizontally. Respiratory pores large, placed a little above the arm bases. 
Arms heavy, short, slightly flattened on the back ; composed of two series 
of short joints. Interbrachials two ; the first extending to the lower sloping 
faces of the first distichals. The palmars in lateral contact except at the 
posterior side, where only the post-palmars connect laterally. Anal plate 
longer than the radials; followed by three and two plates. The plates of the 
ventral disk vary in size; the orals and radial dome plates being more than 
twice as large as the intervening pieces, which are quite numerous. Length 
of anal tube not known. 
Fforizon and Locahty.— Lower Burlington limestone; Burlington, Iowa 
and Southern Missouri. 
Type in the (Worthen) II]linois State collection. 
Batocrinus Calvini Rowtey. 
Plate XLVI. Figs. 8a, b. 
1890. Rowzzy; Amer. Geologist, Vol. V., p. 146. 
Calyx greatly depressed, almost twice as wide as high, with a sharp edge 
around the margin. Dorsal cup low bowl-shaped, a little higher than the 
ventral disk. Plates very slightly convex ; the suture lines distinct, but not 
actually grooved. 
Basals quite small, forming a pentagon without re-entering angles; the 
columnar concavity narrow but rather deep. MRadials as large as both cos- 
tals together, wider than high. First costals quadrangular, twice as wide as 
high; the second pentangular, wider than the first, but narrower than the 
radials; the upper angle quite obtuse. Distichals larger than the costals ; 
represented in four of the rays by two series of two plates, the upper ones, 
