324 PALEOZOIC PALEONTOLOGY. 
condition of the shell. Although the pedicle valve of the species 
has never been observed, there is little doubt of its being cogeneric 
with S. filosa, the type of the genus Schizocrania, which it resembles 
more or less closely. 
ORBICULOIDEA AMPLA (Hall). 
Plate XLI., Figs. 2-3. 
1859. Discina grandis Hall, Pal. N. Y., vol. III., p. 406, pl. 92, figs. 
1 a-d. 
Description.—Shell broadly suboval in outhne. Brachial valve de- 
pressed-subconical, apex subcentral, slightly inclined posteriorly, the 
surface slightly concave from the apex to the posterior margin, becom- 
ing shghtly convex laterally and anteriorly. Surface marked by 
strong, sublamellose, concentric lines of growth, about 0.5 mm. apart. 
Pedicle valve not seen. 
The dimensions of a nearly-perfect brachial valve are: length, 29 
mm.; width, 27 mm.; convexity, 9 mm. 
Remapte! —This species may be easily recognized by its large ae 
and its conspicuous concentric markings. It was originally described 
from the Oriskany sandstone of New York. 
LINGULA? sp. undet. 
Some mere fragments of a linguloid shell, too imperfect for identi- 
fication, have been detected in the “trilobite bed” in the Nearpass 
section. 
STROPHEODONTA MAGNIFICA (Hall). 
Plate XLI., Figs. 5-6. 
See, also, p. 345, pl. XLV. 
Among the representatives of the genus Stropheodonta in the fauna 
of the “trilobite bed” one of the commoner forms seems not to be 
distinguishable from S. magnifica of the Oriskany fauna. The speci- 
mens at this horizon do not attain so great a size as most of those 
illustrated by Hall in the Paleontology of New York, but they are as 
large as the majority of the New Jersey Oriskany specimens. 
