New and Little Known American Paleozoic Ostracoda. 121 
DEPRANELLA ELONGATA, Nl. var. 
late VIL, Figs. sa, 0. 
This form differs from typical D. amp/a in its outline, the dorsal 
margin not being terminated by an angle at its posterior end, and 
the whole carapace being longer in its proportion to its height. 
The length is 2.75 mm.; the greatest height, 1.36 mm. The dor- 
sal nodes are also much less prominent, being, in fact, almost 
obsolete. On the other hand, the depression between them is bet- 
ter defined. The sickle-shaped ridge is also situated farther within 
the edge of the valves, and not quite as much elevated. 
Position and locality: Chazy limestone bottom of Kentucky 
River gorge at High Bridge, Ky.; associated with D. ampla and 
D. nitida. 
JONESELLA, Nn. gen. 
Carapace small, ovate, moderately convex. Valves equal, their 
outline and general aspect much as in Primitia, Jones and Holl, 
but differing in having a simple or more or less divided prominent 
ridge on the posterior two-thirds. This ridge may be variously 
modified, but usually is bent like a horse-shoe, or the anterior half 
is straight and runs lengthwise across the valve. 
Type, J. CREPIDIFORMIS (Leperditia crepiformis, Ulrich, Jour. Cin. 
soe, Nat. Hist., Vol. Il, p. 10, Pl. VII, Fig. 3; 3 2, 1879). 
The relations of this genus, which includes, so far as known, 
_only Lower Silurian species, appear to be with Bolla, Jones and 
Hall, rather than with Primitia on the one hand and Beyrichia on 
the other. In Sola the horse-shoe shaped ridge is centrally 
situated, while in /onese//a it occurs in the posterior half. In true 
species of olla there are also two vertical ridges running parallel 
with the ends of the valve. These are not represented in the new 
genus. 
The generic name is given as a small compliment to Prof. T. 
Rupert Jones, of England. While paleontology is indebted to his 
careful and long-continued labors for the bulk of our present 
knowledge of fossil Ostracoda, I, personally, owe him much for 
kind advice and valuable suggestions. 
