
New and Little Known American Paleozoic Ostracoda. 201 
PRIMITIA GRANIMARGINATA, N. Sp. 
Plate XIT, Figs. 8 a, 6. 
Bide Iength, ©.51 mm.; height, o.33, mm, 
Valves moderately convex, egg-shaped, narrow in front, back 
straight, ends and ventral edge neatly curved, with a sharply 
defined flange. ‘The border at each end with a row of small gran- 
ules. Sulcus represented by a shallow pit just behind the center of 
valve ; on each side of pit a faint impression. 
Eeeniecarly related species occurs at Chester, Ill. It is\ a little 
larger and without granules on the flange. 
Position and locality: Chester group shales, near Grayson 
Springs Station, Ky. 
PRIMITIA SIMULANS, N. sp. 
(Not figured.) 
Size of left valve: Length, 0.78 mm.; height, o.50 mm.; thick- 
ness, 0.18 mm. 
This outline of the valves of this species is very nearly like plate 
12, fig. 8a, the difference being that the hinge line is a little 
shorter, the posterior end very slightly wider and more produced 
in the lower half, and the ventral edge a trifle straighter. The 
flange is the same, except that the row of granules is wanting; but 
the umbilical pit is more central, larger and deeper, and extends as 
a shallow neck-shaped sulcus to the dorsal border. 
Position and locality: Chester group shales, Chester, III. 
PRIMITIA CESTRIENSIS, Nn. Sp. 
(Zypical form not figured; Plate XIV, Figs. 7 a, b, ¢, represents var. 
caldwellensis.) 
Size: Length, 0.84 mm.; height, 0.54 mm.; thickness, of one 
valve, 0.16 mm. 
Valves moderately convex, in profile flattened centrally ; shape 
very nearly like plate 14, fig. 7 a, with the ends a trifle narrower, 
and the central third of the ventral edge more convex. Flange 
distinct, wide at the ends, narrow at the ventral margin. Sulcus 
begianing with a well defined pit at the center of the valves, from 
which it extends, gradually widening and shallowing, to the dorsal 
edge... ,° 
