CALYPTOCRINID®. 359 
als, which are largely represented at the outer walls of the dorsal cup; more- 
over the orientation of the pentangular basal concavity is reversed, its angles 
being directed interradially, while they are radial in C. cornutus and other 
species. Dorsal cup nearly as high as wide, the base broadly truncated, its 
lower margin a little projecting laterally and forming a sharp edge; the 
sides gently curving to near the top, where they slightly contract. The 
suture lines are not shown in Roemer’s type, but we can see from a fragmen- 
tary specimen in our own collection that the basals are very irregular ; three 
of them are quadrangular, the fourth pentangular and larger, the latter 
broadly truncated and supporting a radial, which is smaller than the others 
and slightly convex at the lower face. The other three basals, which rest 
each one between two radials, are distinctly angular below. First costals 
quadrangular, once and a half as wide as long; the second considerably 
larger and pentangular, the distichals arching over its upper angle. First 
interbrachial large, decagonal, almost as wide as long. The plates thin, and, 
so far as observed, without surface markings, except obscure angularities fol- 
lowing the median lines of the radials and brachials, and a small conical 
elevation within the middle of the first interbrachial, 
Horizon and Locality. — Niagara group ; Wayne and Decatur Cos., Tenn. 
Type in the Mineralogical Museum, at Breslau, Germany. 
Remarks. —If this is a true Callicrinus, it differs from all the other species 
of this country, as well as of Europe, in the large size of its basals, which in 
no other species are exposed along the sides of the cup. 
