Preliminary Notes on Cincinnatian and Lexington Fossils 315 
Typical Rhynchotrema incequivalve belongs to the group having 
more numerous lateral plications, the middle parts of the pedicel 
valve are less flattened, and the beak is less erect. 
Geological position. Common in the Paris bed wherever typi- 
cally exposed in Kentucky. The most northern localities are at 
Drennan Springs and at Cynthiana. On South Benson creek, 
and at Frankfort, in Franklin county, it occurs also in the upper 
part of the beds containing Prasopora simulatrix, the character- 
istic fossil of the Wilmore bed. 
Rhynchotrema manniensis, sp. nov. 
{Plate VII, Fig. 4.) 
Mature specimens of this species become full as gibbous as 
chotrema capax. In one specimen with a length and width of 14 
millimeters, the gibbosity or extreme dimension perpendicular 
to the valves was 19 millimeters. This is a gibbosity in excess 
of that normal for Rhynchotrema capax. Rhynchotrema man- 
niensis is a much smaller shell, it appears to be more compressed 
laterally, and has a greater number of lateral plications. Of 
these plications there are about 7 to 9 on each side of the median 
fold in case of the brachial valve. The sinus of the pedicel valve 
usually is narrower, relatively deeper in front, with more abrupt 
limiting slopes. As a matter of fact, however, the chief difference 
is one of size. 
Geological position. In the Mannie shale, forming the upper 
part of the Richmond formation about three quarters of a mile 
west of Riverside, Tennessee; the exposure is located west of the 
home of Mr. Howard, on the road to Flat Woods, east of the 
mouth of Trace creek. It is found at the same horizon at Clifton, 
at the Maddox Mill on Horse creek, and also 32 miles northeast of 
Riverside, on Leiper’s creek, a little over two miles south of Fly, 
north of the home of J. M. Gardner, all in Tennessee. 
Leptsena gibbosa — ^invenusta, var. nov. 
{Plate VII, Fig. 3.) 
Width along the hinge-line about 30 millimeters; the postero- 
lateral parts of the shell being broken away, this width is an seti- 
mate. Fourteen millimeters from the beak, the anterior part of 
