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76 §S. Lyon and S. A. Casseday on new species of Crinoidea. 
and bear on their lower outer edges long filamentous frimbriz, which 
are set closely together, one to each piece forming the arm; these are 
composed of five or six joints, each having a direction outwards or down 
gomery county, Indiana. It is quite an abundant fossil, and generally 
found in a good state of preservation. 
Actinocrinus Coreyi. 
Body, globular; the vault about one third higher than the caly» 
tumid; vault surmounted by a large knob. 
Basal pieces, three; forming together an irregular hexagon, scooped 
out, producing a depression occupying about one-half of the superfices. 
Radials.—The first are large, irregularly hexagonal, wider than high; 
their upper surfaces are hollowed, receiving the second radials, which 
ave a corresponding convexity ; they are thin but wide, flabelliform, and 
bearing the third radials, which are flattened pentagons, axillary, and 
support on each beveled edge three unsymmetrical brachial pieces, five 
or six times wider than high; thence the free arms. 
Interradials, three; the first is very large, generally an elongated 
octagon; above this are two irregular, thin, high pieces, each having 4 
3 abor g ; 
- small depression near the center of their lower surfaces, and interposed 
rms. 
markin 
This intumesence renders the sutures of the pieces very marked. 1 
arms are ten in number, very strong and thick, coming off in five pails; 
we cannot describe them farther, as they are not preserved, and this 5 — 
the only example we have of this species, ; 
Vault—The vault is surmounted by a very prominent knob, from — 
which are Projected in the directions of the arms, five plicatures, formed — 
of four or five (generally four) massive tumerous pieces ; they are much — 
larger than any of the other pieces of the vault, with the exception of the 
central knob. Between each two of the plicatures is an interradial field, — 
containing from eight to ten polymorphous pieces; they are generally a 
