BATOCRINID &. 381 
transverse pieces with serrated lateral margins; the tips infolding. The 
anal plate is a little longer than the radials, and followed by three and two 
plates. The regular sides have two or three interbrachials, of which the first 
is large. Ventral disk low hemispherical, the plates more convex than those 
of the dorsal cup, and almost of uniform size. Anal tube extremely long, 
attaining in one of our specimens a length of five inches, which is nearly 
four inches beyond the tips of the arms; it is stout at the base, but very 
thin at the upper end. Column of less than medium size; the nodal joints 
a little wider than the others; near the calyx they are short and rounded at 
the edges, but they gradually grow longer and cylindrical; at four inches 
from the calyx all the joints are of equal size and of nearly the same height. 
Horizon and Locality. — Same as last. 
Types in the (Worthen) Illinois State collection. 
Lemarks. —We have found it utterly impossible to separate Hall’s 
“ Actinocrinus” papillatus and “ Actinocrinus” inornatus from this species, 
although we took the utmost pains to do so, and had the types for com- 
parison. We have before us over one hundred specimens, which agree in 
all essential points, but differ more or less in the convexity of the plates and 
the form of the calyx. The plates in some of them are entirely smooth, in 
others distinctly convex, and while in some the calyx is much wider than 
high, width and height are almost alike in others. Miller’s B. comparilis is 
identical with the typical form. 
Batocrinus grandis (Lyon). 
Plate XX VII. Figs. 1a, b, and 2a, b. 
1859. <Actinocrinus grandis —Lyon ; Amer. Journ. Sci., Vol. XXVIIL., p. 240. 
1885. Batocrinus grandis — W. and Spr.; Revision Paleocr. Part III., p. 113. 
Syn. Actinocrinus Wachsmuthi— Wurre, 1880; 12th Ann. Rep. Terr. by Hayden (Author’s Edit., 
p. 162), Plate 40, Figs. la, 4, and Geol. Rep. Indiana for 1879-80, p. 142, Plate 7, Fig. 6 (not 
Actinocrinus Wachsmutht White, 1862— Actinocrinus scitulus ; nor Batocrinus Wachsmuthi, 
Revision Paleocr., Part IT., p. 168). 
Larger than the preceding species, and proportionally higher. Dorsal 
cup gradually expanding from the top of the basals to the top of the dis 
tichals, thence abruptly to the bases of the free arms. Plates convex. 
Radials and distichals covered by transverse nodes, the interbrachial plates 
by round ones, which grow shorter as they approach the arm regions. 
Base broad, decidedly lobed ; the plates thickened at the lower end, and 
slightly projecting laterally ; the interbasal sutures deeply grooved. Radials 
