238 PALEONTOLOGY OF OHIO. 



Ordinary examples of Zaphrentis prolifica are usually about an inch 

 and a half in length, but vary from three-quarters of an inch up to three 

 inches. The calice is deep, but is exceedingly oblique, its. greatest height 

 being on the side of the convex curvature of the coral. The septa are 

 alternately large and small, and the primary septa are always more or 

 less bent as they approach the center. The epitheca, when well pre- 

 served, exhibits a few broad and rounded undulations of growth, with 

 more or less distinctly marked longitudinal striae corresponding with the 

 septa. 



Position and locality : Corniferous limestone, Marblehead, Sandusky, Kelley's Island, 

 and Columbus, Ohio. 



Genus ERIDOPHYLLUM, Edwards and Haime, 1851. 

 ( Pol. Foss, des Terr. Pal., p. 423.) 



Eridophyllum steictum, Edwards and Haime. 



Eridophyllwm strictum, Edwards and Haime; Pol. Foss. des Terr. Pal., p. 424, pi. 8, 



fig. 7. 

 Eridophyllum strictum, Billings; Canadian Journal (new series). Vol. IV., p. 133. 



Corallum fasciculate, composed of elongated cylindrical corallites, 

 which have a diameter of from two to nearly five lines, and are placed 

 at intervals apart of about one or two lines. The corallites are strongly 

 annulated by sharp-edged epithecal projections at intervals of from a line 

 and a half to three lines, and at each of the annulations arise small but 

 very conspicuous processes by which the separate corallites are united to 

 one another. Besides the strong periodic annulations, the epitheca is 

 marked by numerous longitudinal striae, corresponding with the septa. 

 Increase is by calicular gemmation, three or four young being usually 

 produced simultaneously from the parent corallite. A well-marked cen- 

 tral tabulate area is present. The septa are well developed in the ex- 

 ternal area of the corallites, where they are united by delicate dis- 

 sepiments. There appear to be about sixty septa in a fully matured 

 corallite, but their number could not be ascertained with absolute 

 accuracy, owing to the condition of preservation of the specimens ex- 

 amined. 



Milne Edwards and Haime state that the connecting processes between 

 the corallites in this species are only poorly developed, but in such ex- 

 amples as I have seen they constitute a very marked feature, being 



