80 
Aug. F. Foerste 
hona-elongata occur about 13 feet below this Columnaria horizon, 
in the upper Waynesville. South of Jefferson county, Stropho- 
mena planumbona is known, in the Waynesville, only from the 
strata immediately beneath the Columnaria horizon, the most 
southern occurrence known in Kentucky being about 4 miles 
north of Bards town. 
Specimens closely similar to Strophomena planumbona occur 
in the Waynesville division of the Richmond at Dismukes Sta- 
tion, 4 miles north of Gallatin, in Tennessee. 
The fossiliferous part of the Liberty section also thins out south- 
ward. The most southern localities for Dinorthis subquadrata 
are at Bardstown, and on Mill Creek, 4 miles east of Bardstown. 
At these localities Dinorthis subquadrata is associated with Stro- 
phomena vetusta, no specimens of Strophomena planumbona hav- 
ing been found. The most southern localities for Strophomena 
planumbona in the Liberty are in the vicinity of Mount Wash- 
ington, in Bullitt county, where they occur only in the basal 
part of the Liberty, immediately over the Columnaria horizon. 
Northward, in Indiana and Ohio, Strophomena planumbona, 
especially the variety Strophomena subtenta, is very abundant in 
the Liberty, especially its lower half. 
The richly fossiliferous horizon at the base of the Liberty may 
be traced as far south as Ray wick, in the western part of Marion 
county, but the only species of Strophomena seen here is Stro- 
phomena sulcata. 
Strophomena planumbona is known also from the southern 
base of Jeptha Knob, in the eastern part of Shelby county, a 
short distance south of J. P. Wellman’s barn. Farther south- 
ward, Strophomena vetusta is seen. Both exposures probably 
belong to the Liberty horizon, although no specimens of Dinor- 
this subquadrata were found. 
It is doubtful whether Strophomena planumbona occurs in the 
Whitewater bed. Interiors of pedicel valves suggesting the pres- 
ence of Strophomena planumbona are seen in the Whitewater 
member at several localities near Dayton, Ohio, but the exteriors 
as well as the interiors of these valves must be seen, in order to 
distinguish between some specimens of Strophoinena vetusta and 
some of Strophomena planumbona. At any rate, Strophomena 
vetusta is very abundant in the Whitewater, and while Stropho- 
mena planumbona may be present occasionally, it certainly must 
occur only as occasional or sporadic specimens. 
