Paleontology of the Cincinnati Group. 



115 



about twenty pieces irregularly disposed in ranges, varying 

 from pentagonal to heptagonal, gradually becoming smaller 

 above ; inter secondary radial areas, each occupied by about 

 twelve pieces, the first heptagonal, second hexagonal, and 

 above ranges of two each, until near the top, where there are 

 three pieces between the secondary radials ; each basal 

 marked with four converging lines on a side ; each triangle 

 on the radials marked by parallel lines at right angles to the 

 side of the plate; these lines continue over on the interradial 

 pieces, but never cross each other, the ends being separated 

 by a row of dots ; arms arise from third secondary radial, and 

 become free on leaving the fifth without bifurcating ; consist 

 of round, wedge-shaped pieces, each supporting a pinnule ; 

 bifurcate on the twelfth piece, and again and again between the 

 twentieth and fortieth pieces; pinnules long, and closely 

 arranged along the inner lateral margins; column sharply 

 pentagonal, composed of alternately thick and thin pieces. 

 (Cin. Quart. Jour. Sci., Vol. I, p. 348.) 

 Locality. — Morrow, Ohio. 



Remarks. — A beautifully ornamented species, intermediate 

 between decadactyhis and dyeri in the number of secondary 

 radials, and having the column pentagonal instead of round. 



5. — G. miamiknsis S. A. Miller, 1882. 



Body proportionally long and very gently expanding, 

 diameter at free arms about two-thirds of length; obconoidal, 

 with interradial and intersecondary radial spaces depressed ; 

 surface smooth or slightly granular, not sculptured ; basals 

 well developed, with high projecting angles between the sides 

 of the first primary radials ; first radials large, about as high 

 as wide, hexagonal, truncated above, central part contracted 

 into a round ridge ; second and third radials smaller than the 

 first, about as wide as high, heptagonal, the radial ridge bifur- 

 cating in the upper third of the third radial; six or more 

 secondary radials form part of the calyx before two arms 

 become free ; in another series only 3 secondary radials ; 

 number of arms unknown, because of the irregularity in 

 those observed, but between 10 and 20; arms long and slen- 

 der, round on outer side, composed of many cuneiform plates, 



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