RHODOCRINIDE. 249 
ment stelliform, somewhat concave, the margin surrounded by concentric strix 
as in Jurassic Pentacrinidx. Basals large, slightly curving upward. Radials 
as wide as high, of the same size as the costals. Distichals 2x2, a little 
shorter than the radials. The four lower palmars form part of the calyx, 
the upper are free; the fixed plates considerably highest, but decreasing in 
height upwards; the three proximal arm plates subquadrangular, the suc- 
ceeding ones gradually turning from cuneate into biserial, meeting laterally 
by a zigzag suture. Arms four to each ray, simple throughout, rather strong 
at the bases; their length unknown. Interbrachials: 1, 2, 3, 2, etc., some- 
what smaller than the adjoining brachials, Anal interradius wider, with 
three plates in the second, and four in the third row. Interdistichals in 
about six ranges, arranged in pairs from the first plate up. Interpalmars 
three to four, arranged longitudinally in single file. Ventral disk and 
anal opening unknown. Column pentangular with re-entering angles near 
the calyx; the joints of nearly equal width; the salient angles of the nodal 
ones bearing a small tubercle. 
Florizon and Locality. — Hamilton group; Canandaigua Lake, N. Y. 
Type in the New York State Cabinet of Natural History at Albany. 
Remarks. — The species is described from a somewhat crushed specimen, 
formerly in the collection of Prof. John M. Clarke of Albany, N. Y., in whose 
honor the specific name is given. 
DIABOLOCRINUS W. and Sp. (nov. gen.). 
(AtaBodos, the devil; xpivor, a lily). 
Syn. Rhodocrinus (in part) — Wurre, 1880; Proceed. National Museum, Vol. II., p. 259. 
Syn. Lyriocrinus (in part) —S. A. Mrtter, 1882; Journ. Cinein. Soc. Nat. Hist., Vol. V., p. 117. 
Syn. Archeocrinus (in part) — W. and Sp., 1885; Proceed. Acad. Nat. Sci. Phila., p. 320. 
Syn. Archeocrinus (in part) — W. and Sp., 1885; Revision Paleocr., Part IIT., p. 98. 
Syn. Archeocrinus (in part) —S. A. Miter, 1889; N. A. Geol. and Palxont., p. 225. 
Calyx depressed globular, with a wide and deep concavity at the bottom, 
involving the infrabasals and large portions of the basals. Infrabasals five, 
small, but projecting beyond the column. Basals large, elongate; their 
upper half directed horizontally or bending upwards; the upper faces broadly 
truncated. Radials not in lateral contact, being separated from each other 
by one or more plates, which rest upon the basals. Costals two. Arms two 
to the ray, free from the first or second distichals ; their structure unknown. 
Arm openings very large, directed obliquely upward, and arranged in groups. 
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