S. Lyon and 8. A. Casseday on new species of Crinoidea. 77 
anged in a pyramidal form; often the vertex being a piece patra tgs 
na than any of the o thers; the basal pieces of the py: are in 
most cases thinner and longer than any of the others ; these as well as 
the remainder of the pieces of this pAgicey are turgid and massive, and 
like those of the calyx, are destitute of ornament. 
On the side of the vault, above the aa eh is a considerable ovoid 
intumescence, composed of near ly thirty small es, whose surfaces are 
quite plain and level in contrast to the 7, es ee, the vault ; on are 
arranged in nearly parallel rows, as follow g with the lowes 
1-38-45 ; on the fifth row (which nearly “completes this field —there are 
but two more rows) gg era an ovoid opening, about one line in Jength, 
without a proboscis. ‘This is the only opening upon the vault. 
e have named this elegant species after Mr. O. W. Corey, to whom 
wé are much indebted for many favors. 
Dimensions. 
Diameter of base, - - - - *32 inch. 
Greatest diameter, - s . 
ight to arms, - - — 
Total height of bod - - Mae 
Diameter of axillary articilation; - — 
Geological Position and Locality—Rare in i deans limestone 
near the top of the knob stone bed, Hardin and Allen aceee Ky., and 
same geological horizon, Washington county, Indiana 
GENUS ONYCHOCRINUS, nov. gen. a & Casseday. 
Generic Formula, 
The column near the calyx is cylindrical, large, 
Composed of very thin articulations similar in size to each other; 
Perforation small, 
: The radials are large, and form, together with the brachials, a 
; continuo us line: the arms are quite robust, furnished with strong 
asal : - . - - 3 
Subradial - » “ : a 5: 
adial, - rz. =f > > z 
Brachial, . é ‘ : - 4or6X5 
Interradial, - - . - - 20 or 25X4 
Anal... - - i “ + -~ 6to? 
Interaxillary, - - - - - 1to3xX5 
Arms, 5 = =. = 5 pairs. 
| e description. _This — in the shape of some of the 
| Pieces and in its general form, resembles more closely orbesiocri- 
: nus than any other; yet they are so widely different in other 
_-Tespects that it will require no great perception to distinguish 
| between t them. 
i 
Inlervadiat al fields, triangular in general shape; an anomalous 
one on the anal side. cea field—long an narrow : one to 
Sse interaxillary pieces on each ra 
ay: 
a 
with the preces small, subradials large, pentangular, alternating 
