I 12 



Citicinnati Society of Natural History. 



radial; on the second of these secondaries another bifurca- 

 tion, giving origin to 2 series of brachials, the first 2 or 3 

 of which appear like tertiary radials, free arms continued 

 from these pieces ; interradial series have 1 piece in first 

 range, between the superior sloping sides of the first primary 

 radials, 2 in second range, 3 in third and fourth ; above the 

 latter 10 or 12 small pieces; anal area with about same num- 

 ber of pieces as interradial, with three in each range above 

 the first piece ; axilliary areas with about 3 small pieces, and 

 each interbrachial area with 2 or more small pieces ; arms 

 20, 4 to each ray, long, slender, simple, rounded on outer side, 

 each composed of a single series of wedge-shaped pieces, each 

 of which supports a pinnule at the upper end ; pinnules alter- 

 nately and closely arranged along the inner, lateral margins, 

 very slender and composed of joints 3 or 4 times as long as 

 wide ; surface ornamented with radiating costae, those passing 

 up the middle of the radials larger and more prominent than 

 the others; others radiate from center of body plates to the 

 sides, where they connect with those on contiguous plates ; 

 column of moderate size, round near base composed of thick 

 and thin segments. (Pal. of N. Y., Vol. I, p. 281 ; Meek, Pal. 

 of Ohio, Vol. I, 1873, p. 30.) 



Locality. — Cincinnati, Ohio ; Madison, Ind.; Maysville, Ky., 

 etc. 



Remarks. — This is a common and very beautiful species in 

 our region, being well characterized by its sculpturing. It is 

 closely allied to the following (G. dyeri), but can be readily 

 distinguished by having only 2 secondary radials instead of 9 

 or 10, as in dyeri. It is also a much more widely distributed 

 species, G. dyeri being restricted in its range. 



2 — G. dyeri Meek, 1872. 



Body globular, sub-turbinate, wider than high, with sides 

 rounding under to the base ; under-basals obsolete, or if pres- 

 ent not exposed externally ; basals very small and projecting 

 as a thin rim below, much wider than high, and trigonal in 

 general outline, with the lateral angles minutely truncated ; 

 first radials of moderate size, heptagonal, wider than long ; 

 second and third a little smaller, the second being hexagonal 



