Preliminary Notes on Cincinnatian and Lexington Fossils 319 
median depression toward the anterior margin of the shell is a 
more constant feature. The result is a general flattening of the 
valve. The line of junction between the valves, when the latter 
are viewed from the front, is more sinuous. The brachial valve 
is never distinctly flattened or depressed anteriorly, but frequently 
is elevated slightly, so as to correspond with the more distinct 
median depression of the pedicel valve. The close relationship 
of this shell to Flehertella borealis is undoubted. 
Geological position. Common in the Paris bed wherever typi- 
cally exposed in Kentucky. The most northern localities occur 
at Drennan Springs in Henry county, and at Cynthiana in Harri- 
son county. It occurs also in the underlying Prasopora simula- 
trix or Wilmore bed, but here it is much less abundant, or is even 
comparatively rare. The specimens here figured are from the 
Paris bed. 
Hebertella maria — ^parksensis, var. nov. 
{Plate VII, Figs. 6, A, B.) 
A comparison of this form with the figures of Hebertella maria 
suggests that the chief difference consists in the larger size of 
Hebertel a parksensis. The latter frequently attains a width of 
25 millimeters, and specimens 28 millimeters in width are not 
rare. The brachial valve is much more convex toward the beak, 
the umbo rising above the level of a plane passing perpendicular 
to the valve at its cardinal margin. A direct comparison with 
the types of Hebertella maria might show other differences. 
Geological position. Abundant in the Greendale division of 
the Cynthiana formation between Pleasant Valley and Millers- 
burg, Kentucky, associated with Orthorhynchula linneyi. The 
type specimens were obtained at Parks Hill, directly south of 
the Licking river, on the railroad between Maysville and Paris, 
Kentucky. Similar specimens but in much smaller numbers 
occur as far south as the middle of Madison county, and west- 
ward as far as Woodford county. In the northwestern corner of 
Woodford county, one mile southeast of McKee’s Ferry, Heber- 
tella man a-p arks ensis occurs in the Perryville bed, associated 
with Orthorhynchula linneyi, 7 feet above the Paris bed contain- 
ing Hebertella frankfortensis and a species of Columnaria. 
