360 I'rocccdiiujs of the Ohio State .Icadcuiy of Science. 



Description. — Corallum a small, curved, tapering cone with 

 a deep calyx. Epitheca thin, and generally shows the edges of 

 the septa. Primary septa thirty to thirty-six in numher. and of 

 nearly equal strength. Secondary septa rudimentar}-, equal in 

 number to the primary. I*\;)ssula on the side of least curvature. 

 Disseppiments not so distinctl}- developed as the primary septa. 



Length 17 to 33 mm. (Greatest diameter 15 mm. 



This coral is characterized by its small size, curved cone, 

 thin epitheca, which exposes the septa, and in crcjss section l)y 

 the equal development of the primary septa. 



Horizon and locality. — Alaxville limestone. 

 Upper zone : ^Nlotith of Buckeve Fork, Fultonham ; (Gladstone 



Mills, White Cottage. 

 Lower zone: Bridge Gully, Cut Xo. 3, 'Sit. Perry-Fultonhani. 



PHYLUM ECHINODERAL\TA. 

 CLASS BLASTOIDEA. 



PENTREMITES ELEGANS-Lyon. 



1858. Peiitrcmites elegans. Lyon, Trans. St. Louis Acad. Sci., Vol'. I, 

 p. 632, pi. 20, figs. 4a-c. 

 Millstone grit : Near Grayson Springs and Litchfield, Kentucky. 

 189L Pcntremites elegans. \\'hitfiekl, Ann. N. Y. Acad. Sci., Vol. V,. 

 p. 577, pi. 13, fig. 4. 

 Maxville limestone: Newtonville, Ohio. 

 1895. Pcntremites elegans. Whitfield, Geol. Sur^-. Ohio, Vol. VII, pt 

 4G(), pi. 9, fig. 4. 

 Maxville limestone : Newtonville, Ohio. 

 1909. Pcntremites elegans. Wood, U. S. Nat. Mus., Bull C4, p. 14, pi. 2,. 

 figs. 10- k2. 



Description. — "Body small, broadly subpyriform, the 

 length equal to about once and a half the height, but somewhat 

 variable with age ; the greatest width being at the base of the 

 ambulacral areas, or considerable below the middle of the height, 

 the outline of the lower portion being nearly straight lines, or a 

 little concave between the base of the ambulacral areas and the 

 lower extremities of the basal plates, while above the form is 



