1 
294 Aug. F. Foerste 
of Calymmene which differs from that usually identified as Calym- 
mene callicephala by its smaller size and by the presence of numer- 
ous granules, larger and more conspicuous than in the latter species. 
The anterior border of the cephalon appears less strongly elevated 
anterior to the glabella. For this form, the name Calymmene 
callicephala-granulosa is suggested here. The typical specimens 
are found in the lower part of the Eden formation, at Cincinnati, 
Ohio. My chief object in referring to this horizon at Rogers 
Gap at the present time is to call attention to the fact that this 
fauna is now known to have a wide distribution in central Ken- 
tucky and evidences of its existence are being found farther north- 
ward. The exposures as far north as Sadieville are practically 
continuous. The same fauna occurs also north of Ford, near 
Hutchison, at the Lower Blue Lick Springs in the northern edge 
of Nicholas county, and northward. Recently, Plectorthis {Eridor- 
this) fiicklesi, and Plectorthis (Eridorthis) rogersensis have been 
found, in strata formerly included in the Lower Eden, at various 
localities between Cincinnati and Foster. Among these localities 
are the quarries at Ivor, the lower part of Nine-mile creek, arid the 
exposures below Fort Thomas. 
Recent observations by E. O. Ulrich indicate that along the Ohio 
river the lower part of the strata formerly included in the Lower 
Eden include a much larger Fulton element than formerly suspected, 
and that the typical Economy fauna begins higher up. This 
lends additional interest to the Rogers Gap fauna, whose peculiari- 
ties were recognized in part even from the earliest observations. 
The exact relationship between the Rogers Gap fauna and that of the 
extended Fulton section, has not been worked out; however, it is 
known that both species of Eridorthis occur in this extended F ulton. 
Sections occupying a similar position at the base of the Eden form- 
ation, and which apparently should be distinguished from the Econ- 
omy bed, occur at Sparta, and west of Drennan Springs, Kentucky. 
The term Nicholas bed Was intended to include only the upper 
part of the Cynthiana formation, consisting of rather coarse- 
grained limestone with relatively few fossils. This part is typi- 
cally exposed between Pleasant Valley and Millersburg. Expos- 
ures occur at least as far south as Winchester, and apparently 
also in the western part of Madison county. Toward the north 
and northwest the limestones become more argillaceous, fine grained 
layers are more frequent, and fossils are more abundant. 
