330 PALEOZOIC PALEONTOLOGY. 
SPIRIFER NEARPASSI Nn. sp. 
Plate XLII., Figs. 19-22. 
Description—Shell very small, wider than long; the hinge-line 
shorter than the greatest width, cardinal extremities rounded. Pedicle 
valve subpyramidal, the beak elevated, incurved, the surface sloping 
abruptly from the umbo to the lateral and anterior margins, lateral 
slopes curving rather abruptly into the cardinal area along the cardi- 
nal margin; mesial sinus shallow, but well-defined, extending to the 
beak; cardinal area high, concave, not sharply-defined. Brachial 
valve depressed-convex, the mesial fold not elevated above the plica- 
tions on either side. Surface of each valve marked by about two 
strong, rounded plications on each side of the fold and sinus, the 
fold and sinus being scarcely more prominent than the plications on 
either side. 
The dimensions of a perfect specimen are: length, 3 mm.; width. 
41-3 mm.; thickness, 3 mm. 
Remarks.—Unless this be an immature form it is quite distinct 
from any of the Helderbergian or Oriskany species of the genus. It 
is believed to be an adult shell, however, because all the specimens 
observed are of about the same size, and no larger shells have been 
seen associated with them, of which they could be the young. The 
species may be recognized by its small size, its subpyramidal pedicle 
valve and its few plications. 
CYRTINA ROSTRATA Hall. 
Plate XLII., Figs. 28-25. 
1859. Cyrtta rostrata Hall, Pal. N. Y., vol. III., p. 429, pl. 96, figs. 
1-6, pl. 98, figs. 8 a—b. 
Description.—Shell subsemi-circular or subsemi-elliptical in out- 
line; hinge-line straight, equaling the greatest width of the shell; car- 
dinal extremities angular, sometimes more or less extended. Pedicle 
valve subpyramidal, with a well-defined mesial sinus extending to the 
beak; beak greatly elevated, angular, often more or less distorted or 
