MEDINAN, NIAGARAN, AND CHESTER FOSSILS 
107 
the valve along its anterior part, as in the species mentioned 
above. The radiating striae, however, are much more numerous, 
numbering 6 to 8 in a width of 3 mm. 
Locality and formation.^ — In the loose chert, assumed to be of 
Laurel age, on Jeptha Knob, Kentucky. 
Cypricardinia jeptliaensis Sp. nov. 
Plate XV A, fig. 6 
Right valve 18.5 mm. long, 9.5 mm. high, and 3 mm. deep. 
Umbo broad and rounded, near the anterior end of the shell. 
The latter extends only about 2 mm. beyond the beak, there 
being a faint concave outline between this anterior end and the 
beak. The general outline of the shell is transversely elliptical, 
highest at the beak and narrowing but moderately posteriorly. 
The posterior border is more narrowly rounded than the anterior 
one. The greatest depth of the valve is at mid-length. There 
is a slight tendency toward flattening in the umbonal area. The 
umbonal ridge is weakly defined and lies near the upper margin 
of the valve. Growth lines are indicated in directions similar 
to those of Cypricardinia arata, but so faint as to be almost im- 
perceptible. Compared with the Racine species, the Jeptha 
Knob form is more elongate, and its posterior portion is less 
elevated; moreover, the umbonal part is broader and flatter. 
Locality and formation. — From the loose chert, assumed to be 
of Laurel age, on Jeptha Knob, Kentucky. 
Lophospira bucheri Sp. nov. 
Plate XV A, fig. 9 
Shell 40 mm. in height, 32 mm. in maximum width, with a 
vertical height of 22 mm. at the aperture, and an apical angle of 
60°. There are 6 or 7 volutions. Along the last half of the 
last volution there is a salient peripheral angle extending about 
1.5 mm. beyond the general convexity of this part of the shell. 
Along the corresponding part of the preceding volution the per- 
ipheral angle is sharply angular but not salient. Here the upper 
part of the last volution conceals the lower part of the preceding 
