NATURAL SCIENCES OF PHILADELPHIA. 57 



DESCRIPTIONS OF NEW SPECIES OF INVERTEBRATE FOSSILS FROM 

 THE CARBONIFEROUS AND DEVONIAN ROCKS OF OHIO. 



BY F. B. MEEK, 



OF THE Ohio State Geological Survey.' 



The fossils described in this paper are some of the new forms 

 collected during the progress of the Ohio Geological Survey, now 

 being prosecuted under the direction of Prof. J. S. Newberry-, the 

 State Geologist. Illustrations of these and other characteristic 

 fossils from the different formations are in course of preparation, 

 and will be published along with full descriptions of the same in 

 the reports of the Survey. 



ECHINODERMATA. 



DOLATOCRINUS ORNATUS, Meek. 



Body, including the vault, depressed subglobose, the portion 

 below the arm-bases being a little higher than the vault, with 

 nearly vertical sides above, but rounding under below to the 

 somewhat flattened under side ; arm-bases protuberant, mainl}' in 

 consequence of the rather deep furrows or sinuses of the vault 

 over the iuterradial areas ; vault composed of irregular pieces, 

 each of which projects in the form of a little sharply prominent 

 node or short spine, the largest of which are situated around the 

 nearly central ventral tube, and on the elevations between it and 

 the arm-bases. Base small, a little impressed within the shallow 

 concavity of the nnder side, and marked by a distinctly indented 

 column-facet, which occupies near three-fourths of its entire 

 breadth, so that only a narrow ring, as it were, of the basal pieces 

 can be seen when the column is attached. First radial pieces 

 comparatively large, extending out nearly horizontally, or only a 

 little arching upward, and with their inner ends curving slightly 

 into the shallow central concavity ; all wider than long, and 

 hexagonal, with the upper (outer) side of each longer than any 

 of the others. Second radial pieces about half as large as the 



' I am under obligations to Prof. Henry for the use of books, rooms, and 

 other facilities at the Smithsonian Institution, while preparing this paper. 



June 6, 1871.] part i.— 5 



