308 PROCEEDINGS OF THE ACADEMY OP 



DESCRIPTIONS OF NEW WESTERN PALEOZOIC FOSSILS, MAINLY FROM 

 THE CINCINNATI GROUP OF THE LOWER SILURIAN SERIES OF 

 OHIO. 



BY F. B. MEEK. 



Full illustrations and descriptions of the fossils described in 

 this paper are in course of preparation for the report of the Ohio 

 Geological Survey, now being prosecuted under the direction of 

 Prof. J. S. Newberry, the State geologist. 



RADIATA. 

 ECHINODERMATA. 



HETEROCRINUS EXIGUUS, Meek. 



Body small, obconoidal, or tapering from above to the column, 

 near which it becomes pentagonal in consequence of the flattened 

 surface of each of the basal pieces. Sub-basal pieces obsolete, or 

 very minute. Basal pieces (subradials of some) of moderate 

 size, about as wide as long, pentagonal, and almost perfectl}' flat. 

 Left posterior ray bifurcating first on the fifth piece, the first 

 piece being comparatively large and irregularlj^ hexagonal, in 

 consequence of having a short sloping side on its upper right edge 

 for the reception of one side of the first anal piece ; the four suc- 

 ceeding pieces much narrower, about as long as Avide, and rounded, 

 and more or less constricted in the middle, with expanded upper 

 and lower ends. Right posterior ray bifurcating first on the 

 eighth piece, the first piece being decidedly smaller than that of 

 the left posterior ra}-, pentagonal in form, and slightly longer 

 than wide ; while the second is of the same breadth but shorter, 

 rounded on the dorsal side, and irregularly pentagonal in form, 

 the fifth angle being formed by a short side on the left above, for 

 the reception of the first anal piece ; succeeding pieces about as 

 long as wide or slightly longer, rounded and constricted in the 

 middle, and expanded at the ends. Right anterior lateral ray bi- 

 furcating first on the sixth piece, the first piece being distinctly 

 larger than the others, apparently a little longer than wide, and 

 subpentagonal in form ; while those above are smaller, and of the 



[February 13, 



