CALYPTOCRINID.E. 351 



as long. Second cost.ils 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. 



Hemarks. — This may be a small specimen of £1, Elrodi, with which it 

 agrees in the general form, and in the proportionate size of the plates. 



Eucalyptocrinus turbinatus S. A. Miller. 

 Plate LXXXIL, Fig. 13. 



18S2. S. A. Miller; Journ. Ciucm. 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 

 npper 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. Eadial.s, 

 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. 



Horizon and Localitij. — Same as last. 



Tijpe in the collection of Mr. W. C. Egan. 



Remarks. — This is probably a good .sj^ecies. 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 



