122 Cincinnati: Society of Natural Ffiistory. 
JONESELLA CREPIDIFORMIS, Ulrich. 
Tate, VILL TASS SiG ORG. 
The illustrations on Plate VII. represent different views of a 
complete example obtained from washings of the lower shales of 
the Cincinnati Group made at Covington, Ky. 
JONESELLA PEDIGERA, N. Sp. 
Flate VIT, Figs. 9 a, 0. 
Carapace oblong, subquadrangular; ends rounded, usually sub- 
equal, but the anterior often a little the widest; dorsal edge 
straight, the extremities of same angular; ventral margin straight- 
ened in the middle, but curving neatly upward into the anterior 
and posterior edges. A very narrow flange all around. Surface 
of valves slightly flattened centrally, the slope being most abrupt 
near the margins. A faint depression is sometimes to be observed 
near the middle of the dorsal slope. The ridge is shaped like the 
head of a shepherd’s crook, the bent portion being on the posterior 
half of the valve. It begins with a small, rounded knob a short 
distance in front of the center of the postero-dorsal fourth of the 
valve, then bending backward and downward proceeds toward the 
postero-ventral region, where with an abrupt curve it turns to pro- 
ceed in nearly a straight line toward the center of the lower half of 
the anterior margin. The extremity of the ridge is often liberated, 
and projects as a blunt spine over the anterior slope. 
Size of average specimen: Length, 1.05 mm.; height, 0.63 mm. 
Another valve, differing slightly in its outline, afforded the follow- 
ing measurements: Length, 1.15 mm.; height of anterior third, 
0.65 mm.; height of posterior third, 0.73 mm.; length of hinge 
line, o.8 mm.; thickness, 0.26. | 
The peculiar shape of the ridge in this species serves well in 
distinguishing it from all other Ostracoda known to me. 
Position and locality: Rather rare in the lower shales of the 
Cincinnati Group, at Covington, Ky. 
JONESELLA DIGITATA, N. Sp. 
FAN ERVATE TES AOD. WU, Gr 
Carapace oblong, the length and height respectively as seven is 
to four; anterior half just appreciably wider than the posterior, or 
