— 
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ao THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
width, widest at two thirds their height; slightly contracted at the top and 
twice as long as their width at the bottom; the outer surface a little convex, 
and somewhat angular along the median line; facets deeply excavated to 
almost the full width of the plate, leaving a slight truncation at each side. 
Costals and distichals two each, united by syzygy, their combined length about 
equal to the width; both costals and the lower distichal completely resting 
within the radial facet. Lines of union between the hypozygal and epizygal 
joints straight, but those between the costals and distichals, and between the 
distichals and palmars, decidedly waving and much more distinct. The upper 
faces of the epizygal joints provided with tongue-like processes, which enter 
corresponding recesses upon the lower faces of the plates of the succeeding 
order. First palmar deeply excavated along the upper face, and constituting 
a part of the calyx; the succeeding ones are free arm plates, and bend ab- 
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ruptly outward. Arms twenty, strong, simple, biserial and pendent,.resting 
by their dorsal surfaces upon the radials and anal plate, which are slightly 
impressed thereby. Pinnules stout and long; their ambulacral furrows wide, | 
and roofed over by small covering plates. Ventral disk slightly convex, 
almost flat, the ambulacra exposed to view. Four of the interradu have but 
one plate in contact with the radials, while the anal plate supports three, the 
former as well as the latter abutting against the second distichals, but not 
against the first, nor against the costals, which rest within the radial facet. 
Anal opening subcentral, passing through the flat surface of the disk. Column | 
round and small. | 
Horizon and Locality. — Kaskaskia group; Grayson Springs, Grayson Co., 
Ky., and Sloans Valley, Pulaski Co., Ky. | 
Types in the Major Lyon collection, Jeffersonville, Ind. 
Remarks. — A strict enforcement of the rules of nomenclature would, 
according to some opinions, require the above specific name to be rejected | 
on account of erroneous composition. After being so long recognized in 
scientific literature we prefer not to change it,—at least not until greater 
necessity appears for doing so. 
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