Paleontology of the Ciuciumiti Group. 159 



prominent, scarcely larger than 2 mm., and distant from each 

 other by double their diameter ; the largest calices on certain 

 of the monticules are scarcely ^ or Vi mm. broad." (Prod, 

 de Paleont., 1S50, vol. i, p. 25. Edwards and Haime, Poly. 

 Foss. des Ter. Palseoz. Archives du Mus. d' Hist. Xat., 1851, 

 vol. 5, p. 266.) 



Acca///)'.— Cincinnati, Oxford, etc., Ohio; Madi.son, Indiana; 

 Covington, Kentucky, etc. 



Remarks. — This is an illy-defined form. It was named and 

 described or characterized in 1850 in a single line by D'Or- 

 bigny. In 1851 Edwards and Haime re-described and illus- 

 trated it, and this description is quoted above. The corallites 

 are thin-walled and sub-equal, without interstitial cells. Speci- 

 mens are found from 4 to 5 inches in diameter attached to shells 

 of Ambojiychia. I have seen one of these in which the corallum 

 extended an inch beyond the shell upon which it grew, and 

 the bases of the corallites were plainly visible. The upper 

 surface showed numerous elevations that seemed almost like 

 the beginnings of branches. The tabulae of the cells are com- 

 plete and horizontal, and may be close or remote, according to 

 the point at which the section has been made. 



4. — M. iRRKGUL.\Ris. Ulrich, 1880. 



Corallum small, about ^ of an inch in diameter, spheroidal, 

 and apparently free ; surface nearl}- smooth or covered with 

 nodules; monticules none ; corallites of one kind only, thin- 

 walled, polygonal, radiating outward from one point to all 

 parts of the surface ; tabuke almost obsolete, although com- 

 plete, transverse partitions are occasionally developed, gener- 

 erally at corresponding levels in contiguous tubes. (Jour. 

 Cin. Soc. Nat. Hist., vol. 2, (Feb., 1880,) p. 129: Nicholson, 

 Genus Montic, 1881, p. 177.) 



Locality. — Hamilton, Morrow, etc., Ohio. 



Remarks. — This species is similar to M. turbviata in shape, 

 but it is easily separated by the nodulated surface and smaller 

 corallites. In the collection of the late Mr. U. P. James is a 

 specimen with a conspicuous pointed base and a puff-ball like 

 form. Another has six conspicuous nodulations, the surface 

 of these being entirely smooth. 



[TO BE CONTINIED.] 



