New and Little Known American Paleozoic Ostracoda. 197 
BYTHOCYPRIS INDIANENSIS, nN. Sp. 
Plate XVI, Figs. 11 a, 4, ¢. 
Size of left valve: Length, 1.13 mm.,; height, 0.62 mm.; thick- 
Mess. 0. 22 mm. 
This species, of which I have seen only the left valve illustrated, 
is closely related to B. punctulata, the chief differences being as 
follows: £B. indianensis is comparatively a little longer, has the 
dorsal edge thicker, slightly grooved and incurved, and the test is 
not punctate. The species is also very much like B. olli, Jones, | 
from the Wenlock of England, but the profile in end and ventral 
views is different. 
Position and locality : Devonian Bryozoa bed, Falls of the Ohio. 
BAIRDIA LEGUMINOIDES, 0. sp. 
Tae KVIL ies. 5 a, 0, ¢. 
size, engin, 1.42 mm.; height, o.75.mm.; thickness, 0.55 
mm. 
Carapace elongate, ends acuminate, subequal, the posterior a 
little more blunt than the anterior; dorsal edge arched in the mid- 
dle, concave on each side to the extremities; ventral edge unusu- 
ally convex, the curve almost uniform. Left valve much larger 
than the right, with a thick, overlapping edge all around. Right 
valve with a faintly marked central spot. Both valves more ven- 
tricose in the posterior two-thirds than usual in this genus. 
The side view resembles that of B. degumen, Jones and Kirkby, 
but in other respects the two species are quite distinct. None of 
the species described by Reuss and Kirkby present any striking 
resemblances. 2B. deguminoides seems to differ from them all in 
_ having the posterior end blunter than the anterior. 
Position and locality: Shales of the Hamilton group, 18 mile 
ereek, N. Y. 
PACHYDOMELLA, Nn. gen. 
Carapace exceedingly ventricose; valves thick and strong, the 
left much the largest, its thick edges overlapping the right valve 
at all sides. Dorsal side strongly arched, ventral edge more 
nearly straight, ends subequal. A faintly impressed, subcentral 
umbilical pit. 
