Manual of the Paleontology of the Cincinnati Group. 



81 



63. — M. papillata McCoy, 1850. 



Corallum forming very thin layers, parasitic on brachiopods, 

 Orthoceras, etc., generally about one-half a line thick; surface with 

 conical or rounded monticules, arranged with more or less regularity, 

 a little wider than high, usually about twice their diameter apart, this 

 diameter being about half a line ; the monticules with cells larger than 

 the average, about ten in each cluster, the smaller cells being about 

 nine or ten in one line; calices polygonal, thin walled, bearing in well 

 preserved examples a small number of spiniform tubuli ; no interstitial 

 cells. (Ann. & Mag. of Nat Hist., 2d ser., vol. 6, 1850, p. 284, as 

 Nebulipora. Nicholson, Pal. of Ohio, vol. 2, 1875, p. 210.) 



Locality. — Cincinnati and Hamilton, Ohio. 



64. — M. parasitica Ulrich, 1882. 



Corallum parasitic, usually attached to Streptelasma, varying in 

 thickness up to one line, two or more patches frequently coalescing 

 and leaving a ridge between them ; surface with conical monticules, 

 regularly arranged in decussating series, the summits usually appearing 

 to be solid, but really occupied by minute cells, the cells on the slopes 

 with apertures slightly larger than the average ; interspaces with poly- 

 gonal and moderately thin-walled cells ; interstitial cells only on the 

 monticules; corallites thin walled and polygonal, usually thickened at 

 the angles of junction where spiniform tubuli occur ; walls with a granu- 

 lar appearance ; tabulae forming vesicles upon one or both sides of the 

 tubes, with horizontal tabulae extending across the intervening space. 

 (Jour. Cin. Soc. Nat. Hist., vol. 5, Dec, 1882, p. 238.) 



Locality. — Oxford, Ohio. 



65. — M. asperula Ulrich, 1883. 



Corallum parasitic, consisting of thin, sub-circular expansions, 

 two to five lines in diameter, and 0.3 to 0.8 of a line in thickness ; 

 surface with small, conical monticules, arranged in regular intersect- 

 ing series, occupied by cells slightly, if at all larger than the ordinary 

 ones; generally the apices are occupied by one or several spiniform 

 tubuli, often considerably larger than those in the intervening spaces ; 

 calices small and unequal in size ; walls of corallites thin ; tabulae 

 wanting; angles of junction of cell walls occupied by very large and 



