228 New Species of Fossih from Ohio. 



upward at their outer edges. Basal plates small, forming by their combi- 

 nation a neai'ly regular pentagon. Sub-radials proportionally large, wider 

 than liigh, four hexagonal and one on the anal side heptagonal. Subradi- 

 als short, but not very broad, twice to twice and a half as wide as long ; the 

 cicatrix for the sacond radials very large and nearly straight. The anal 

 plates, three of which are preserved, are longer than wide. Column small, 

 round, composed near the calyx of alternately small and large plates, with 

 very coarse radiatmg lines of articulation. Surface of calyx smooth, except 

 a line of granules just within the margin of the sub-radial plates. 



Tlie second niclial plates present tlie strong specific feature of 

 the species, and are large and spine-bearing, as in Zeacriuus 

 mucrospinus, McClies. The spines are long, ranch thickened 

 and bnlbous in the lower ]iart, presenting in this respect a strong 

 contrast with those of that species. The cicatrix for the attach- 

 ment of the arm-plates is very large, showing that the j^hites 

 above were of large size. Arms and dome nnknown. 



The species has been quite abnndant, as the spines are found 

 in great numbers, and vary considerably in size, Jiccording to 

 the width of the first radial plates upon which they have rested. 

 But all are thickened and bulbous, and many of them are more 

 than an inch in length. They are seldom found attached to 

 the calyx, but are scattered through the shale in the bed where 

 found. 



Formation and Locality. — In shale of the Coal-measures at 

 Carbon Hill, Hocking Co., Ohio. Named in honor of H. Moores, 

 Esq., of Columbus, Ohio, their discoverer. 



BRACHIOPODA. . 

 Discina iTIeekana, n. sp. 



Pal. O., Yol. Ill, Plate 11, Figs. 1—3. 



Disdna nUida ? (Phil.) M. and W., Geol. Ills., Vol. V, p. 572, pi. 25, fig. 1;— 

 not B. nitkla, Phillips, Geol. Yorkshire, Vol. II, p. 221, pi. 11, figs. 10—13. 

 Shell of moderate size or larger, circular or sub-circular in outline. Dorsal 

 valve convex, with an elevated beak Avhich is directed backward and situ- 

 ated at about one-third of the length of the shell from the posterior margin. 

 Posterior slope slightly concave just below the apex; anterior slope convex. 

 Surface of the shell, when preserved, marked by fine, even, but elevated 

 and regular concentric lines, with flattened interspaces ; about ten or eleven 

 of the elevated lines occupy a space of an eighth of an inch on the middle 

 of a shell, being finer within and coarser beyond that point. On the par- 

 tially exfoliated shell, fine radiating vascular lines are perceptible. Ventral 



