Paleontology of the Ciiiciiiiiati (,'toiip. 205 



tabulx, more numerous in the smaller than in the larger 

 ones ; walls thickened toward the mouths and apparently 

 fused with one another; larger corallites shown in cross 

 sections to be oval or circular, and moderatel)' thick-walled. 

 (Prodr. de Palaeont., 1850, p. 25 ; Nicholson, Genus Montic, 

 1881, p. 1 10.) 



Locality. — Cincinnati and vicinity. 



Remarks. — A common and variable species, easily distin- 

 guished by the conspicuous monticules and the great num- 

 bers of smaller tubes surrounding the larger ones. Two 

 forms have been given varietal names as below : 



Var. RUGOSA (Edwaids & Haime), Nicholson, 1881. 



Differs from the type in the surface having transverely 

 elongated monticules, forming, in many cases, transverse 

 ridges, these varying in length, sometimes extending round 

 the stem, usually with sharp edges, and about one-half a line 

 apart ; calices and interstitial tubes as in the type ; internal 

 features the same as in the type form. (Brit. Foss. Cor., 1854, 

 note on p. 265; Nicholson, Genus Montic, 1881, p. 113.) 



Locality. — Cincinnati and vicinity. 



Var. DALii (Edwards & Haime), Nicholson, 1881. 



Differs from the type in the smaller-sized monticules, and 

 smaller number of interstitial tubes ; the monticules are 

 gently rounded, or somewhat transversely elongated ; internal 

 structure is the same as in the type form. (Brit. Foss. Cor., 

 1854, p. 265; Nicholson, Genus Montic, 1881, p. 115.) 

 {Chcetetes approximatiis Nicholson, Quart. Jour. Geol. Soc 

 Lond., vol. 30, 1874, p. 502. Callopora siibnodosa Ulrich, Geol. 

 Sur., Illinois, vol. 8, 1890, p. 417.) 



Locality. — Cincinnati, Blanchester, etc., O.; Illinois. 



Renixrks. — Prof. Nicholson has recognized that his Chcrtetes 

 approximatiis is a synonym for this form. There can scarcely 

 be a doubt but that Callopora siibnodosa is also a synonym. 

 The points of difference between the two are not sufficient to 

 separate them. 



