New and Little Known American Paleozoic Ostracoda. 203 
ULRICHIA EMARGINATA, Nn. sp.* 
PAG OIE TES MO) A OG. 
Compare, Leyrichia tuberculo-spinosa, Jones and Kirkby, Ann. and 
Miao w Nat mist) ser. 5, vol. 18, pli 8, figs. 7 and, 8. 
SVeamlenethy o.on mm-,' height, o.38 mm; thickness, 0.24 
mm. 
This species may not be distinct from the Beyrichia tuberculo-spr- 
nosa, J. and K., from the Carboniferous deposits of Great Britain, 
which, in a recent letter, Prof. Jones suggests should be removed 
to Ulrichta. ‘Their species, as figured, differs from U. emarginata 
in being a little longer, in having the cardinal angles sharper, the 
ventral and posterior margins more convex, and in having no flat- 
tened border or flange. ‘There is also a difference in the size and 
arrangement of the tubercles, but no great importance is to be 
attached to them since they are liable to vary in those respects. 
The Lower Silurian Fvimitia nodosa, or Ulrichia nodosa as it 
should now be called, resembles U. emarginata sufficiently to ren- 
der their generic identity reasonably obvious. 
Position and locality: Chester group shales, near Grayson 
Springs, Ky. 
ULRICHIA (?) CONFLUENS, Nn. sp. 
Tlatew NTT, Figs. 11 a, 0: 
Size) Weneuh, 1:35 mm; height, 0.78 mm.; thickness of left 
valve, 0.34 mm. 
Valves suboblong, slightly oblique; dorsal edge straight, rather 
long, meeting the anterior curve without forming an angle; anterior 
end uniformly convex, ventral edge very gently curved, posterior 
margin obliquely truncate above, rounded and most prominent 
in the ventral half. Surface with a ,-shaped depression just 
above the center; around it, and taking up nearly all of the remain- 
ing surface, a low rounded ridge, witha low swelling on it near 
the central of the ventral margin, a small tubercle at each of the 
antero-dorsal, antero-ventral, and postero-ventral angles, and two 
*The genus U/lrichta has just been proposed by Prof. Jones (Quart. Jour. 
Geol. Soc. for November, 1890,) for the reception of U. conrad, Jones, anu 
the group of species mentioned in the remarks on Primetia nodosa (ante p. 
135.) It will be noticed that I there expressed myself as favoring a generic 
separation from Przmztza, though totally unaware of the fact that Prof, Jones 
had arrived at the same conclusion. 
