CALYPTOCRINID 2. 351 
as long. Second costals about the size of the first, a little higher at the 
median line, their upper end slightly truncated by the interdistichal. First 
distichals almost as large as the costals. The form of the other plates 
indeterminable. 
Horizon and Locality.— Niagara group ; near Chicago, Ills. 
Types in the collection of W. C. Egan, Esq., of Chicago. 
Remarks. —This may be a small specimen of /#, Elrodi, with which it 
agrees in the general form, and in the proportionate size of the plates. 
Eucalyptocrinus turbinatus 8. A. Miturr. 
Plate LXXXIL., Fig. 13. 
1882. §S. A. Mitrer; Journ. Cincin. Soc. Nat. Hist., Vol. V., p. 82, Plate 3, Figs. 5 and 5 a. 
A rather large species. In the cast, the calyx is nearly as high as wide, 
the dorsal cup obconical, slightly constricted above the radials, the extreme 
upper end abruptly curving upwards; the suture lines are defined by angu- 
larities, and the inner spaces of the plates are slightly concave. The disk 
appears depressed hemispherical, with ten well-marked longitudinal ridges 
representing the ambulacral grooves. 
Basal concavity moderately deep and obscurely pentangular. Radials, 
as exposed in a side view, comparatively small, wider than long. First 
costals quadrangular, nearly as long as wide. Second costals pentangular, 
a little larger than the first, the sloping upper sides steep, the upper angle 
truncated by the interdistichal. First distichals as large as the second 
costal ; the second much smaller; the palmars minute. First interbrachial 
a third longer than wide, barely touching the radials. The two plates above 
forming a rhomb with the two acute angles truncated. Interdistichal com- 
paratively short. Length of the partition walls, and the neck-like prolonga- 
tion of the calyx not known. 
Florizon and Locality. — Same as last. 
Type in the collection of Mr. W. C. Egan. 
Remarks. — This is probably a good species. Fragmentary specimens 
with the plates intact, apparently representing this form, occur in the 
Niagara group of Decatur Co., Tenn. The basal concavity is narrow, and 
the radials have a truncation at the bottom, of which the edges project 
rather broadly over the sides of the column. The truncated upper faces 
of the interbrachials and interdistichals supporting the partition walls are 
