576 Contributions to Invertebrate Palaeontology. 



SPECIES FROM THE MAXVILLE LIMESTONE, THE EQUIVALElsT 



OF THE ST. LOUIS AND CHESTER LIMESTONES 



OF THE MISSISSIPPI VALLEY. 



CCELENTERATA, RUGOSA. 



CYATHOPHYLLID^. 



Genus ZAPHREIVTIS Rafinesque, 



Zaplireiitis Cliffordaua. 



Plate XIII, figs. 1-3. 



Zaphrentia Cllffordana Edwards aud Haune, Polyp. Foss. Terrains Paljeoz., 

 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 tapering and distinctly curved, without dis- 

 tinct varices of growth, hut showing slight corrugations of the surface in most 

 individuals. Rays well developed, 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 showing the lines of 

 the rays impressed on its surface. 



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

 mon form on the surface of the limestone, and is somewhat per- 

 sistent in character, 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 specimens 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 Maxville. The originals of the species are cited from 

 IJutton-mole Knobs, near Louisville (Keokuk limestone); and from 

 Mammoth Cave, Ky. (Chester limestone). 



