Paleontology of the Cinrinna/i Grouf>. 207 



the larp^er ones in one or two rows, and these are about one- 

 half their size. (Jour. Cin. vSoc. Nat. Hist., vol. 6, 1S83, p. 

 250, as Atactoporella neivporlcusis.) 

 Locality. — Newport, Ky. 



38. — M. OHiOENSis James, 1S84. 



Coralliim dendroid, stem and branches mostly cylindrical 

 or sub-cylindrical, sometimes flattened, sometimes tumid ; 

 branches irregular, generally dichotomous, varying in size 

 from one and one-half lines to six lines wide, sometimes one 

 and one-quarter inches across branches; surface with numer- 

 ous conspicuous elevated monticules, arranged in alternate 

 manner, one-half line in diameter at base and about the same 

 distance apart ; larger calices circular or sub-polygonal ; the 

 smaller round or angular, numerous ; walls thicked at the 

 mouths; corallites in the axial region with thin walls, 

 polygonal and curving abruptly toward the surface ; walls 

 thickened and apparently' fused together just outside the 

 sharp curve ; tabulae in the axial region few or wanting, but 

 toward the surface more numerous, complete and horizontal ; 

 interstitial tubes no more closely tabulate than the larger 

 ones ; in tangential section corallites rounded, the interstitial 

 tubes varying in shape. (Jour. Cin. Soc. Nat. Hist., vol. 7, 

 1884. p. 137.) 



Locality. — Cincinnati, O. 



Remarks. — This species is well characterized by its robust 

 form and the conspicuous monticules. 



39. — M. woRTHEXi James, 18S2. 



Corallum dendroid, of cylindrical or flattened stems, 

 branching irregularly, from one to two lines in diameter ; 

 surface with small, prominent monticules, arranged in alter- 

 nating, longitudinal rows about one line apart; apices appar- 

 ently solid, the slopes occupied b}' cells of ordinary size or 

 larger ; calices sub-circular or angular, margins thick ; no 

 interstitial corallites ; longitudinal sections show corallites 

 with thin, simple, wavy or tortuous walls, thickening toward 

 the surface and opening obliquely; no tabulae in the axial 



