198 PALEONTOLOGY OF OHIO. 



allites, which are of rather larger size than the average, but which ^re 

 not set upon distinct elevations. The}' thus approach C. pulchellus, Edw. 

 and H., from which they are distinguished chiefly by the fact that the 

 corallites of the groups in question exceed the average corallites in point 

 of size only very slightly, and not to such an extent as to constitute a 

 conspicuous feature. Other specimens from the Cincinnati group, which 

 are apparently referable to this species, do not exhibit any large sized 

 corallites beyond an occasional individual here and there, and these ex- 

 amples have such a large number of minute tubuli surrounding the ordi- 

 nary corallites that I was at first disposed to consider them as a distinct 

 species. In many respects, C. Fletcheri very nearly approaches C. gracilis, 

 James, but the latter species is usually branched at shorter intervals and 

 at more acute angles, whilst the corallites are much more oblique to the 

 surface, and the calices aie on an average decidedly smaller. 



There appears to be no doubt but that C. Fletcheri is in part identical 

 with C. lycoperdon, Hall ; but so many forms have been included under 

 this name that it seems impossible to retain it for any one of them. 



Position and locality: Cincinnati group, Cincinnati, Ohio. 



Chetetes geacilis, James. 



Plate 21, figs. 8, 86. 



Chxtete.s gracilis, James (named but not figured or described). Catalogue of the Fos- 

 sils of the Cincinnati Group, 1871. 



Corallum dendroid, the branches solid or hollow, cylindrical or sub- 

 cylindrical, dividing dichotomously at short intervals and at very acute 

 angles (usually from 25° to 40°), fxom less than one line to two lines or 

 more in diameter. Corallites very small, from ten to twelve in the space 

 of one line, opening obliquely on the surface by oval or sub-triangular 

 calices, the walls of which are separated by very distinct lines of demark- 

 ation, and between which are placed more or fewer very minute tubuli. 

 The surface shows no elevations or tubercles, but is entirely smooth, and 

 altogether destitute of anj^ groups of large-sized corallites The margins of 

 the calices are sometimes finely granulated. This species may in general 

 be distinguished by the oval, or rounded, thick- walled calices, and the mi- 

 nute dimensions of the ordinary corallites, together with the marked 

 obliquity of the corallites to the surface, and the very acute angle at 

 which the stems bifurcate. These characters, together with the entire 

 absence of any corallites of larger size than the average, sufficiently sep- 

 arate G. gracilis from C. Fletcheri, with which it is, however, very closely 



