PALEONTOLOGY. 483 



Genus ZEACRINUS Troost. 

 Zeacrinus Mooresi. 

 Plate XI, figs. 6-10. 

 Zeacrinus Mooresi Whitf., Ann. N. Y. Sci., 1882, p. 227. 



Form of entire body unknown. Calyx of moderate size and pentagonal in 

 outline, very broadly cyathiform or shallow cup-shaped ; thrt region of the basal 

 plates being impressed, and the radials but moderately curving upward at their 

 outer edges. Basal plates small, forming by their combination a nearly regular 

 pentagon. Subradials proportionally large, wider -than high, four hexagonal and 

 one on the anal side heptagonal. Subradials short, but not very broad, twice to 

 twice and a half as wide as long ; the cicatrix for the second 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 radiating lines of articulation. Surface of calyx 

 smooth, except a line of granules just within the margin of the subradial plates. 



The second radial plates present the strong specific feature of the 

 species, and are large and spine-bearing, as in Zeacrinus mucro-spinus Mc- 

 Chesney. The spines are long, much thickened, and bulbous in the 

 lower part, presenting in this respect a strong contrast with those of that 

 species. The cicatrix for the attachment of the arm-plates is very large, 

 showing that the plates above were of large size. Arms and dome un- 

 known. 



The species has been quite abundant, as the spines are found in great 

 numbers, and vary considerably in size, according 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 county, Ohio. Named in honor of H. Moores, Esq., of 

 Columbus, Ohio, their discoverer. 



MOUJJSCOIDEA. 



BRACHIOPODA. 



Genus DISCINA Lamarck. 



Discina Meekana. 



Plate XI, figs. 1-3. 



Discina nitida? (Phil.) M. and W., Geo!. 111., vol. v, p. 572, pi. 25, fig. 1. 



Not Discina nitida Phillips, Geol, Yorkshire, vol. ii, p. 221, pi. 11, figs. 1(M3. 



Discina Meekana Whitf., Ann. N. Y. Acad. Sci., 1882, p. 228. 



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

 valve convex, with an elevated beak which is directed backward and situated at 

 about one-third of the length of the shell from the posterior margin. Posterior' 

 slope slightly conca\o jMst 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 at 



