178 Cincinnati Society of Natural History. 



Formation and Locality: Lower Silurian, Cincinnati Group, 

 Blanchester and Clarksville, Clinton County, O. 



24. M. whufieldi, U. P. James. 

 The Paleontologist, 34, 1881. 



Corallum dendroid, variable, very irregularly branched, the 

 branches either close together or some distance apart ; often 

 rounded at the ends, sometimes swollen or flattened as if hollow ; 

 surface smooth; calices variable in size and form, polygonal, oval, 

 circular, pentagonal, etc. Sometimes groups of calices larger than 

 the average scattered irregularly over the surface; also groups of 

 from six to ten small interstitial tubes ; walls of corallites thin. 



Obs. A characteristic feature of this species is the great varia- 

 tion of the calices, and the wrinkled condition of the walls, al- 

 though this last is by no means confined to this species. 



Formation and Locality : Lower Silurian, Cincinnati Group, 

 Cincinnati, O. 



25. M. ANDREWsii, Nicholson. 



Monticulipora {Heterotrypa) andrcwsii, Nich. Genus Montic, 

 128, 1881. 



ChcRtetcs pulchcUus, Nich. {non Edwards & Haime). Quart. 

 Jour. Geol. Soc. XXX., 503, 1874; Pal. Ohio IL, 195, 1875. 



Callopora andr'cwsii, Nich. Ulrich, Jour. Cin. Soc. N. Hist, 

 v., 252, 1882. 



Monotrypella csqualis, Ulrich. Ibid, V. 247,1882. 



Corallum variable, but generally dendroid, branches sub- 

 cylindrical, two to six lines in diameter, flattened, expanded or in- 

 osculating. Surface with clusters of from five to seven cells slightly 

 larger than the average, and though elevated, yet not enough to 

 form monticules. Calices polygonal or sub-polygonal, separated by 

 a moderate number of smaller intersUtial tubes, developed 

 principally at the angles of junction of corallites; cell walls thin in 

 center of branches, thickened toward their mouths. 



Obs. This species was first referred by Nicholson, as above, 

 to the M. pidchclla of Edw. and Haime, but was afterward described 

 as distinct. It was put as Chatetes pulchelliis in Pal. of Ohio, where 

 the following remarks are made. '' C. pulchcllus a^ords an excel- 

 lent instance of the enormous difficulty which the observer has to 

 encounter when he examines an extensive suite of specimens of 

 these corals, and would endeavor to separate one form from others 

 nearly allied to it. So great is this difficulty that it must be under- 



