PALEONTOLOGY. 465 



SPECIES FROM THE MAXVILLE LIMESTONE, THE EQUIV- 

 ALENT OF THE ST. LOUIS AND CHESTER LIMESTONES 

 OF THE MISSISSIPPI VALLEY. 



CCELENTERATA, RUGOSA. 



CYATHOPHYLLID.E. 



Genus ZAPHRENTIS Rafinesque. 



Zaphrentis Cliffordana. 



Plate IX, figs. 1-3. 



Zaphrentis Cliffordana Edwards and Haime, Polyp. Foss. Terrains Palaeoz., p. 329. 

 pi. 3, fig. 5. 



Corallum small, measuring from an inch to one inch and a half in height, with 

 a transverse diameter at the summit of from five-eighths to three-fourths of an inch ; 

 somewhat regularly taperingand distinctly curved, without distinct varices of growth, 

 but showing slight corrugations of the surface in most individuals. Rays well de- 

 veloped, numbering from thirty to thirty-six in the primary series, with an equal, 

 number of secondaries which are much less strongly developed ; the primary series 

 extending nearly or quite to the centre of the rather deep calyx. Transverse plates 

 strongly developed. Fosset situated on the inner side, strong, deep, and extending 

 to the middle of the calyx in the specimens seen. Epitheca thin, frequently show- 

 ing the lines of the rays impressed on its surface. 



The species does not attain a very large size, but is a very common 

 form on the surface of the limestone, and is somewhat persistent in char- 

 acter, the greatest variation being in the somewhat more rapid expansion 

 of some examples. The specimens from Ohio accord quite closely with 

 that figured by the authors of the species as cited, and also with speci- 

 mens from the Chester limestone from several localities in the western 

 States, especially from Chester, Ills. 



Formation and Locality. — In the Maxville limestone, at Maxville and 

 Newtonville, Ohio. I found them quite plentiful on the surfaces of blocks 

 of limestone, at Winona Furnace, obtained at Culver's quarry, near Max- 

 ville. The originals of the species are cited from Button-mold Knobs, 

 near Louisville (Keokuk limestones); and from Mammoth Cave, Ky. 

 (Chester limestone). 



Cyathocrinus Maxvillensis, n. sp. 

 Plate IX, figs. 5-8, 



Cyathocrinus inequidactylus Whitf., Ann. N. Y. Acad. Sci., 1882, p. 219. 

 Not C. inequidactylus (McCoy) W. and Sp. 



Body of rather small size. Calyx deep cyathiform, being nearly hemispherical 

 in one example, and somewhat broad obconical in another, and composed of smooth 

 plates, which have only the general convexity of the body, or very slightly tuberose. 



30 G. O. 



