New and Little Known American Paleozoic Ostracoda. 175 
produced into sharp points. A small tubercle in the antero-dorsal 
region; between it and the center of each valve a large ovate spot 
is distinguishable in most specimens. ‘The lower half of this spot 
marks the point of greatest convexity of each valve. The two 
ends with a well-defined flange. Right valve with the ventral 
edge thick and abruptly bent inward; two rather widely separated 
small pits situated close to the antero-ventral edge; one or two of 
these pits also behind the ventral overlap. Left valve more con- 
vex than the right, and less abruptly deflected at the ventral edge; 
a well-marked thickening along the posterior half of the dorsal 
margin. In both valves, but in the left especially, the slope from 
the point of greatest convexity toward the margins is somewhat 
flattened. Surface impunctate, polished; color dark brown. 
The thickening along the posterior half of the dorsal edge of the 
left valve, allies this species to a group consisting of Z. gzbbera, 
and scalaris, Jones, L. tyraica, Schmidt, and one or two others. 
The L. appressa of this paper likewise belongs to this group, as may 
L. tumidula also. L. linneyz differs from the three first named in 
the outline, and in having the surface of the valves less uniformly 
convex. 
Named for the late W. M. Linney, who was the first to bring 
the species to my notice. 
Position and locality: Not uncommon in heavy bedded gray 
limestone belonging to the uppermost division of the Trenton lime- 
stone, near Harrodsburg, Perryville, Danville, Frankfort and other 
localities in central Kentucky. The horizon is above the Bracht- 
ospongia bed. 
LEPERDITIA TUMIDULA, Nn. Sp. 
PEP WEISS. A a, 0. 6. 
f Length, 9.0 mm.; length of hinge line, 6.5 mm.; 
(height, 6.0 mm.; thickness (a right valve), 2.3 mm. 
Carapace of mediurn size, obliquely subovate, widest and moder- 
ately produced posteriorly ; ventral curve strong, most pronounced 
in the posterior half; dorsal margin comparatively long, straight ; 
the extremities simply angular, not produced beyond the curve 
of the ends. Ventral edge of right valve very thick, flattened, 
abruptly curved inward, the overlapping portion produced lip-like 
_beyond the line of contact between the ends of the valves; one 
small pit on each side. Flange moderate. Valve tumid in the 
Size: 
