36 TJie Paleontologist. [June 10, 



Group, in Clinton and Warren counties, Ohio. C. gracilis is quite 

 as abundant on the hills at and near Cincinnati. The two are not found 

 associated, as far as known to the writer. 



MoNTicuLiPORA [Ckcstetes) varians, James. 



Ch^tetes varians, James. (Paleontologist, July 2, 1878.) 



In the brief description of this species, referred to above, it was men- 

 tioned as resembling CJicEtetes jamesi, Nicholson (Pal. of Ohio, vol. ii.) 

 After more careful examinations, and comparisons of many specimens, 

 since that date, the writer is fully convinced that the two are distinctly 

 different from each other. In mode of growth they differ widely; the 

 stems of C. jamesi grew in a cylindrical form with tumid swellings, 

 and branched frequently, sometimes dichotomously, at variable dis- 

 tances and angles, the branches dividing often, in a similar manner, 

 the stems, in some cases, hollow; the hollow ones being filled with clay 

 or flattened by pressure. C. varians never shows any such mode of 

 branching; the growth was sometimes in an irregularly, somewhat con- 

 torted, flattened, lobate form, two or three inches across, springing 

 from a narrow cylindrical base, and giving off rounded or sub-cylindrical 

 branches in a digitate manner; others spread over other corals, or shells, 

 and grew in very irregular, amorphous shapes, from one to four or five 

 inches in diameter, throwing out shoots, or branches in various direc- 

 tions; others in thin layers (seemingly the beginnings of corallums), on 

 other substances, reaching over the edge at one side, where the branches 

 are thrown out ; other specimens spread out in a frondose manner, with 

 a piece of thin coral, or shell for a central object, showing both faces 

 equally celluliferous; still other various forms might be mentioned, but 

 these seem sufficient to illustrate the wide difference between the two 

 species. 



The tube walls are much stronger in C. jamesi than varians ; the 

 calices of the latter are more regular in outline ; generally subcircular, 

 oval or polygonal, of which there are five or six in the space of one line, 

 measuring in any direction. In the case of some of the sub-frondose 

 forms, grown upon both sides of other corals or shells, where ground off 

 or broken away, the tubes are shown as growing direct from the central 

 object, and opening at the surface at irregular angles. Most examples 

 have only a few scattering interstitial pores between the larger cells, but 

 in the case of one observed specimen, however, many of the small pores 

 are shown. 



The best localities, as far as known to the writer, for this species, are 

 near Rlanchester and Clarksville, Clinton county, Ohio. Upper part of 

 Cincinnati Group, where it is abundant ; whilst C. jamesi is found only 

 in the lozvcr beds. 



GENUS DEKAYIA. Edwards k Haime. 

 Dekayia maculata, sp. nov. James. 

 Corallum composed of cylindrical, or sub-cylindrical stems from two 



