New and Little Known American Paleozow Ostracoda. 183 
the valves are small, rather convex, irregular or subpentagonal in out- 
line, with the ends subequal, narrowly rounded and most prominent 
in the lower half, the ventral edge straightened on each side of the 
protruding center, and the back straight, rather short, and without 
cardinal angles. An undefined and scarcely perceptible depres- 
sion occasionally in the dorsal slope. Surface most elevated near 
the posterior margin, with the slope to this edge concave, the 
central portion of the valves depressed convex, and the slope to the 
anterior, dorsal, and ventral margins abrupt. 
The posterior elevation I regard as representing the posterior 
spine of A. wnicornis. This, together with the subpentagonal out- 
line of the valves, will serve in distinguishing the species. 
Position and locality: Same as the preceding. 
ENTOMIS WALDRONENSIS, Nn. sp. 
miaie X17, Figs: 3 a, 3 6b. 
Size of right valve: Length, 10.6 mm.; height, 6.7 mm.; thick- 
ness, 2.6 mm. 
Valves oblong, subelliptical, moderately convex, back straight 
but short, ends subequal, the posterior strongly curved, the anterior 
subangular in the upper half; ventral edge moderately convex. 
Sulcus deep, subcentral, nearly vertical, extending from the dorsal 
margin more than two-thirds across the valve. A small tubercle to 
one side of the sulcus. No flattened border. Surface smooth. 
This species is much larger than £. madisonensis, described in 
Part I of this paper. The sulcus is also less curved, and the two 
halves of the valves are not unequally convex as in that species. 
Position and locality: Shales of the Niagara group, near Wald- 
ron, Ind. 
ZCHMINA ABNORMIS, N. sp. 
Piate ATS, Figs. 7 a, 7 0. 
Size: Length, 1.53 mm.; height, 0.95 mm. 
Valves ovate, with the anterior end a little narrower than the 
posterior, the dorsal edge straight and subangular at the extremi- 
ties, the ventral margin rather strongly convex. A large lobe 
slightly overhangs the posterior margin; another is situated just 
within the anterior half of the ventral margin. Spine strong, 
