Contributions to Invertebrate Palseontology. 597 



111., vol. V, pi. 24, figs, a, b), but the tubercles are very distinctly 

 granulose. It, however, does not possess the structure of Enpachy- 

 crinus, having only one small anal plate, the upper end of which 

 projects above the line of the first radials. The only specimen yet 

 obtained of the species measures about three-fourths of an inch in 

 diameter, and is about three-sixteenths of an inch high to the top 

 of the first radial plates. 



Formation and Locality. — In the Coal Measures at Carbon Hill, 

 Ilocking Co., Ohio. Collected by Mr. Somers, of Columbus, Ohio- 



Genns ZEACRIIVUS Troost. 



Zeacriiius Mooresi. 



Plate XV, figs. 6-10. 



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



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

 outline, very broadly cyatliiform or shallow cup-shaped ; the 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 Zeacrinvs mucro- 

 spinus McChesney. The spines are long, much thickened, and bul- 

 bous 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 unknown. 



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 Co., Ohio. Named in honor of H. Moores, 

 Esq., of Columbus, Ohio, their discoverer. 



