New and Little Known American Paleozoic Ostracoda. 129 
EURYCHILINA AZ.QUALIS, nN. Sp. 
aie EX, figs. 5, 6, 7 and 8. 
Valves subelliptical to subcircular, equilateral; an average speci- 
men 1.54 mm. long, and 1.15 mm. high. Body of valve strongly 
and uniformly convex, sub-elliptical in outline, 1.18 mm. long, 
0.82 mm. high, and 0.3 mm. thick (z. ¢., one valve only). Sulcus 
central, narrow, not very deep, nor extending to the dorsal mar- 
gin. Marginal area strongly convex, widest at the ventral side, 
where it averages about 0.3 mm., becoming narrower gradually as 
it passes around the ends to the extremities of the dorsal line. 
No flange or frill is developed to interrupt its uniform convexity. 
Entire surface smooth. 
The width of the ventral portion of the marginal area varies 
considerably in different individuals of this species. The extremes 
in this respect so far noticed are represented by the figures. 
Compared with other species &. granosa probably offers the 
greatest resemblance. The absence of granulations, also of a 
node, and the less marked mesial sulcus, and more nearly circular 
form of #. wegualis, serve amply in discriminating between the two 
species. £. subeguata, a new species from Minnesota, has a 
granulose surface, a flat marginal area, and is slightly more 
elongate. 
Position and locality: Chazy and Birdseye limestone, at High 
Bridge, Ky. Also at Lebanon, Tenn., where it occurs in the 
‘« Glade ”’ limestone. 
EURYCHILINA OBESA, 0. Sp. 
Plate IX, Fig. 13. 
Valves subquadrate, equilateral, strongly convex, about 1.5 mm. 
long and 1.0 mm. high. Dorsal margin straight, nearly as long as 
the entire carapace. Upper halves of anterior and posterior mar- 
gins nearly straight, the angle of junction with the dorsal edge 
about 100°; below curving uniformly into the more gently convex 
ventral edge. Body of valve tumid, the entire surface granulose, 
with only an obscure, broad depression to indicate the usual 
median sulcus. Marginal area of nearly equal width all around, 
rather narrow, being only about 0.15 mm. wide. It is covered 
with closely arranged radial rows of very minute granules. 
