New and Little Known American Paleozoic Ostracoda. 187 
of the genus by the shorter and more erect character of the sulci, 
and more strongly papillose surface. | 
Position and locality: Devonian Bryozoa bed, Falls of the Ohio. 
CTENOBOLBINA INFORMIS, N. Sp. 
ae NOV. Tos, 0-000 GC. 
Size of right valve: With frill; length, 1.51 mm.; height, 0 g2 
mm.; thickness, 0.35 mm.; without frill, length, 1.4 mm.; height, 
0.85 mm. 
' Valves subovate, back straight, ends strongly convex, the 
anterior the narrowest ; ventral edge convex, rounding uniformly 
into the ends; dorsal angles obtuse. Sulcus deep and very wide, 
extending a little more than half across the valves. Posterior and 
median lobes united, U-shaped, thick at the bend, with three 
undefined swellings, cae forming the major part of the posterior 
lobe, the second at the antero-ventral portion of the bend, while 
the third, comprising the upper half of the median lobe, projects 
slightly beyond the dorsal edge. Anterior lobe wanting, this por- 
tion of the valve being evenly convex. Frill bent inwards, scarcely 
distinguishable in a side view, concave on the inner side ana form- 
ing a channel around the contact margin of the valve. Surface 
smooth. 
This rudely marked species, though deviating in several import- 
ant respects from the typical species of the genus, still retains, I 
believe, the more essential characters of Ctenobolbina. An approach 
toward Lollia is recognizable, particularly to such a form as ZB. (?) 
auricularis, Jones, but that species is not a good Bolla, and, as I 
view it, would be more fittingly disposed of under Crenobolbina. I 
hesitate, however, to propose such an arrangement, because the 
relationship to my proposed genus Hallella is perhaps even more 
intimate. 
Position and locality: Devonian Bryozoa bed, Falls of the Ohio. 
CTENOBOLBINA (? BOLLIA) ANTESPINOSA, 0. Sp. 
TIGA Va Figs. 9 a, b,c. 
Size of left valve: Length without frill, 1.9 mm.; height, 0.9 
mm.; thickness, 0.4 mm.; height with frill, 1.0 mm. 
Valves elongate-ovate, widest posteriorly, ends boldly curved, 
