= 
BATOCRINID&. 453 
Macrocrinus lagunculus (Hatt). 
Plate XX XV. fig. 4. 
1860. Actinocrinus lagunculus-— Hat; Suppl. Geol. Rep. Iowa, p. 41. 
1867. Batocrinus lagunculus —M. and W.; Geol. Rep. Illinois, Vol. V., p. 367. 
1881. Batocrinus laguaculus — W. and Sp.; Revision Paleocr., Part IL., p. 166. 
A very small species of the type of Macrocrinus verneuilianus, but the 
dorsal cup proportionally longer, and the arm openings formed into an 
almost continuous ring around the calyx. Calyx once and a half as high 
as wide. Dorsal cup conical, as high as the width at the arm bases; the 
sides a little convex. Surface of plates slightly elevated, and beveled at the 
margins, 
Basals moderately short, thickened at their lower margins, and forming a 
rim, which is not indented at the sutures. Radials longer than wide, the 
superior faces concave. First costals twice as wide as long, quadrangular ; 
second costils pentagonal, exceptionally hexagonal in the postero-lateral 
rays. The anterior ray has 3 X 2 distichals and two arms; the antero- 
lateral but one distichal and four arms; while the two postero-lateral 
ones, which sustain three arms, have toward the anal side a distichal and 
two palmars, and at the opposite side three distichals, making sixteen arms 
to the entire species. First anal plate as large as the radials, slightly longer 
but narrower; the second anal a little larger than the two interbrachials 
aside of it. The next row consists of two or three pieces. The four regular 
sides contain three plates, which are arched by the arm-bearing brachials, 
and also those of the posterior side. 'Tegmen conical, gradually passing into 
the anal tube, which is very stout; plates nodose, decreasing in size as they 
approach the arm-bases. Orals excentric ; the posterior one standing erect, 
to one side of the anal tube. 
Horizon and Locality. — Keokuk group; Warsaw, Ills., and Keokuk, 
Towa. 
Type in the Mlinois State collection, Springfield. 
