Paleontology of the Cincinnati Group. 185 



bearing surface buried and the basal surface exposed. The 

 description above given is that of Nicholson. 



12. — M. ECCENTKic.v James, 1882. 



Corallum piano- or slightly concavo-convex, sub-circular, 

 small, from one to two lines in diameter, and one-half a line, 

 or less, thick ; under surface often exposed in specimens 

 imbedded in the rock, flat or slightly concave ; epitheca thin, 

 with fine concentric lines, having a starting point near one 

 margin ; fine lines also radiate from the eccentric starting 

 point to the margin ; bases of corallites easily seen through 

 the epitheca ; upper surface gently convex, smooth ; calices 

 circular, similar in size, with a few of the central ones 

 slightly larger than the others ; walls thin ; interstitial coral- 

 lites few or numerous ; cross section shows oval tubes with 

 somewhat thickened walls, distinctly separated, the inter- 

 spaces occupied by curved or angular lines; corallites curv- 

 ing slightly at the base, then taking an oblique course to the 

 surface ; tabuloe horizontal in the small, but mostly oblique 

 in the larger tubes. (The Paleontologist, No. 6, Sept. 12, 

 1882, p. 48.) 



Locality. — Cincinnati, O. 



Remarks. — This species can be readily recognized by its 

 small size, and by the eccentric radiation of the striae on the 

 epithecal membrane. It is possible that these, peculiarly- 

 arranged striae are due to the growth of the coral upon the 

 shell of Schizocrania filosa. Should this actually prove to be 

 the case, the species would better be considered the same 

 as M. lens, or possibly be placed as a variet}- of that species. 



13. — M. FALESi James, 1884. 



Corallum free, oval or round ; the upper surface low and 

 convex in the oval specimens, and steep and conical, with a 

 small apex in the round ones ; varying in size from about 

 one-half to three-quarters of an inch in diameter, and from 

 one-quarter to three-quarters of an inch high ; margins thin 

 and sharp ; under surface peculiar in possessing a regularly- 

 outlined conical groove, extending nearly across the middle 



