ACTINOCRINID&. 567 
It is quite probable that:Miller’s Steganocrinus Benedicti* belongs to this 
species. Its arms are given off in exactly the same manner, and it has the 
same style of ornamentation, only the calyx appears to be a little shorter 
than is usual in that form. We doubt if it is a Steganocrinus, for the brachials 
of each ray, according to the figures, are in sutural contact laterally to the 
base of the free arms, instead of being given off from the sides of tubular 
appendages extending to almost the tips of the arms. It is also possible that 
Miller’s Actinocrinus grandis is identical with our species. His description is 
insufficient for accurate comparison, and his figures show the rays only to 
the first palmars. Besides the name was preoccupied by Lyon in 1809.7 
Actinocrinus magnificus W. and Sp. (mov. spec.). 
Plate LIL. Fig. 2. 
Syn. Actinocrinus lobatus WortHEN (not Hall), 1890, Geol. Rep. Illinois, Vol. VIIT., Plate 12, Figs. 8, 82. 
As large as the preceding species. Calyx apparently higher than wide, 
broadly truncate at the base, slightly constricted at the top of the second 
costals, and more deeply at the interbrachial spaces. The brachial lobes 
directed obliquely upward, not very prominent, and beginning from the 
upper end of the distichals, so that there are actually two lobes to each ray, 
separated by a deep sulcus, with a few interdistichals at the bottom. Plates of 
the dorsal cup proportionally thin and slightly convex, their surfaces marked 
by ridges, which are not mere surface elevations, but folds m the substance 
of the plates, and which gradually disappear as they pass inward. The 
surface of the ridges is covered by rows of obscure nodes, which produce 
a beautiful ornamentation ; the middle of the plates is smooth or slightly 
tumid, except upon the radials, which have low, transverse elevations, from 
which three or four parallel ridges or folds pass out to the basals, while 
there is generally but one between the other plates. 
Basals very large, forming a deep and broad cup, almost as high as wide 
at the bottom; the lower end not thickened nor projecting over the top of 
the column. Radials large, as long as wide, or a little longer; the costals 
one half smaller, hexangular and heptangular, the second one nearly as 
large as the first, and both as long as wide. Distichals all axillary, slightly 
* Ady. Sheets 18th Rep. Geol. Surv. of Indiana, p. 27, Plate 4. 
+ Amer. Journ. Sci., Vol. XXVIIT., p. 240. 
