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Cincinnati Society of Natural History. 



first radials 5, pentagonal, higher than wide, truncated above; 

 second radials 5, quadrangular, higher than wide, equal in 

 size, truncated above and below, lateral margins depressed ; 

 third radials 5, pentagonal, higher than wide, wider above, 

 with two articulating surfaces upon which the rays divide ; 

 lateral edges depressed into the borders of the interradial 

 spaces ; upper margin slightly excavated ; brachials in two 

 series, the first 10, quadrangular, higher than wide, equal in 

 size and alike in form ; second series 10, pentagonal, higher 

 than w 7 ide, w T ider above with 2 articulating facets, from each 

 of which an arm arises; arms 20, long, slender, composed of 

 equal, quadrangular pieces, about as wide as high; pinnules 

 long and delicate, originating on alternate arm plates; anal 

 and i?iterradial spaces filled by a great number of small, deli- 

 cate, generally hexagonal plates. (Jour. Cin. Soc. Nat. Hist., 

 Vol. IV, 1881, p. 83.) 



Locality. — Cincinnati, O. 



4. — R. magnificus S. A. Miller, 1883. 



Body robust with prominent radial ridges; under basals 5, 

 low, small, triangular on the outer face ; basals 5 longer than 

 wide, ridge prominent; primary radials 3x5, first and third 

 series of about equal size ; secondary radials 4 or 5 x io, a 

 ridge arising from the second and passing upward toward the 

 vault; no tertiary radials; arms 24, bifurcating soon after 

 becoming free, when 4 again bifurcate ; composed of cunei- 

 form plates, large and long with strong' pinnules; first inter- 

 radial rests on the superior side of a basal, and is followed by 

 about 20 interradials not disposed in transverse ranges ; 

 coluimi pentagonal. (Jour. Cin. Soc. Nat. Hist., Vol. VI, 1883, 

 p. 230, as Gaurocrinns) 



Locality. — Warren Co., O. 



Genus 2.— CANISTOCRINUS Wachs. & Spring., 1885. 



Closely resembles Reteocrinus in general aspect ; radial 

 ridges strong, tube-like ; interradial spaces deeply depressed ; 

 symmetry bilateral ; underbasals, perhaps, indistinctly devel- 



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