On the MonticuHporotd Corals of the Cincinnati Group, i 5 



ON THE MONTICULIPOROID CORALS OF THE CINCIN- 

 NATI GROUP, WITH A CRITICAL REVISION OF THE 

 SPECIES. . 



By U. P. James and Joseph F. James, M. S., Prof, oj Botany 

 and Geo/ogv in Miami Universii\\ Oxford, O. 



(Concluded from Volume X, p. 184 ) 



Group IV. Laminar ox Fiondescenf. 



Expanded or flattened, generally formed of two layers of cor- 

 allites, diverging from a central axis. 



a. Surface with conspicuous, generally elongated monticules. 



* Interstitial corallites absent 35 



* Interstitial corallites few . . 36 



* Interstitial corallites numerous 37 



h. Surface with small, rounded monticules, or nearly smooth. 



* If present, monticules formed of small tubuli ; coral- 



lites direct to surface 38 



* Calices in intersecting, diagonal lines; elongated, 



pentagonal 39 



* Corallum irregular. 



t Calices circular 40 



t Calices irregular in form 41 



35. — M. CLEAVELANDi, U. P. James. 



Monticulipora {Hetcrotrypa I) cleavelandi, James, The Palaeont. . 

 49. 1882. 



Corallum lobate or amorphous, with flattened or cylindrical 

 branches. Surface with rounded monticules, more or less conspic- 

 uous, about one line apart, occupied by calices larger than in other 

 places. Calices [jolygonal or sub-circular. No interstitial pores at 

 surface. (Place i, Fig. 4). 



Obs. — This species presents various forms, often branching, 

 but generally forming irregular masses. The cells are arranged in 

 rows of from eight to ten, and the monticules in alternating rows. 

 There are no interstitial pores to be observed. 



Formation and Locality. — Lower Silurian, Cincinnati Group, 

 Highland Co., Ohio. 



36. — M. UAWSONI, Nicholson. 



Monticulipora {Hetcrotrypa) dawsoni, Nich, Genus Mon tic , 141, 

 1881. 



