Cincinnati Society of Natural History. 



ating costse, starting from the center of each piece, and pass- 

 ing, one to each of its sides, so as to connect with others on 

 each contiguous piece ; of these costse those passing up the 

 middle of each of the radial series are a little larger and more 

 prominent than those of the interradial plates, while they 

 bifurcate with the rays so as to send a division up each of the 

 secondary radial series, toward the upper part of which they 

 become more prominent and rounded, being those about the 

 size of the free arms. (Proc. Acad. Nat. Sci., Phila., for 1872, 

 p. 314; Pal. of Ohio, Vol. I, p. 32.) 

 Locality. — Cincinnati, Ohio. 



Remarks. — A variety was described by Miller in 1878 (Jour. 

 Cin. Soc. Nat. Hist., Vol. I, p. 103), under the name of var. 

 sublcevis. As the only distinguishing mark was an absence of 

 sculpturing, the founder of the species rightly concluded later 

 on (Ibid, Vol. VI, 1883, p. 217) to abandon it. 



3. — G. subglobosus Meek, 1872. 



Originally described as a variety of G.-dyeri, from which it 

 differs by a much stouter body, which is also less rounded 

 below, while the arms and the ridges extending up to the 

 radial and anal plates are stouter ; column, much thicker; 10 

 or 12 secondary radials between the first bifurcation on each 

 ray to the second division. (Proc. Acad. Nat. Sci., Phila., for 

 1872, p. 314; Pal. of Ohio, Vol. I, 1875, p. 34, as G. dyeri var. 

 subglobosus.) 



Locality. — Cincinnati, Ohio. 



4. — G. fornshelli S. A. Miller, 1874. 



Body obconoidal, about 1% times as high as wide and ta- 

 pering to the column ; basa/s 5, pentagonal, wider than high ; 

 first radials much larger than basals, heptagonal, nearly as 

 wide as long, inserted in angle produced by two basals ; 

 second radials octagonal, as long but not as wide as the first; 

 third radials heptagonal, about the size of the second, each 

 supporting two secondary radials; secondary radials 5, first 

 two nearly as large as the primary radials, others much 

 smaller; interradial series consists of 1 hexagonal plate in 

 the first range, 2 in the second, 3 in the third ; above these 



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