210 Cincinnati Society of Natural Fiistory. 
marginal furrow into which the edge of the smaller valve is 
inserted. 
This species 1s shorter and thicker than the Warsaw C. glandella, 
Whitfield. In most respects it resembles the European Tertiary 
species C. compressa (Von Miinster) Bosquet, very closely. 
Position and locality.: Shaly limestones at the top of the Chester 
group, Caldwell Co., Ky. | 
BAIRDIA CESTRIENSIS, Nn. sp. 
Plate XVIT. 125: 0:0, Oa 
{ Fig. 6; length, 1.05 mm.; height, 0.57 mm.; thickness, 0.45 mm. 
COAT Gat anes Ours CS ue OFA Ge SE Org2tree 
Carapace strongly convex, drawn out and pointed posteriorly, 
narrowly rounded anteriorly, with the centro-dorsal margin arched, 
the antero-dorsal straight, the postero-dorsal gently concave; ven- 
tral edge nearly straight in the middle, strongly bent upward in 
front, and only a little behind. 
Related to B. ventricosa, Kirkby, but is shorter, with the anterior 
end less acute, the postero-dorsal margin less concave, and the 
ventral on the whole more convex. : | 
Position and locality: Shales of the Chester group, near Gray- 
son Springs, Ky. 
PONTOCYPRIS (?) ACUMINATA, N. Sp. 
Fiale XVI. Figs: 8 a. 
Size: . Length, 2.37 mm.; height, o.85 mm-; thicknecsm@mone 
valve, 0.46 mm. : 7 
Of this species I have seen only a single valve. ‘The generic 
relations are therefore in doubt. If it is reaily a Pontocypris then 
it is a left valve and correctly figured. If, on the other hand, it 
should belong to a very elongate Lazrdia (like L. mucronata, Reuss, 
or B&B. siliquotdes, J. & K., but relatively longer), 1t would be a right 
valve and the most convex edge the ventral. Provisionally, or 
until a complete carapace is found, the species had best be arranged 
as above. 
