116 
[Assembly 
DESCRIPTIONS OF NEW FOSSILS. 
First Group, 
POSIDONIA. 
Posidonia lirala. — Shell suborbicular, convex depressed; disk with 
about 18 concentric angulated carinas, and with concentric stria?. 
Length, nearly one inch. Locality j near Norwich, Chenango county. 
Pterinea. 
1. Pterinea hisulcata. — Shell oblong, inflated, with two oblique fur- 
rows diverging from the beak, forming an intermediate carina, which is 
obsolete on the inferior half of the disk; surface with concentric sulci, 
obsolete on the posterior side. Length 21 inches. Locality. Caze- 
novia, Madison county. 
2. Pterinea concenirica. — Shell ovate oblong, compressed, with nu- 
merous profound concentric strise; disk obliquely contracted from beak 
to base; posterior end dilated, margin rounded. Length, li inches. 
Locality, near Norwich, Chenango county. It much resembles a Modip- 
la in outline. 
3. Pterinea appressa. — Shell ovate oblong, flattened, disk with dis- 
tant angular concentric carinas and striated; umbonial slope very oblique 
and carinated; dorsal margin rectilinear, parallel with the basal margin. 
Length, 3 inches. Locality, same as the preceding. 
4. Pterinea punctulata. — Shell profoundly elongated; disk with an 
oblique furrow from beak to base; surface covered with minute eleva- 
ted punctas disposed in form of rays on the anterior side; umbonial 
slope carinated; dorsal margin recurved; posterior extremely truncated; 
posterior basal margin straight. Length, 21 inches. Locality, same as 
the preceding. 
5. Pterinea cuneata. — Shell oblong ovate; posterior side profoundly 
elongated, subcuneiform; surface with obselete concentric carinas; disk 
obliquely contracted from beak to base. Length, 2 inches. Locality, 
near Oneonta, Otsego county. 
6. Pterinea triqueter. — Shell obliquely triangular, cordate; posterior 
slope flat, profoundly dilated; umbonial slope marginal, acutely angu- 
lated; surface with simple lines of growth. Length, from beak to pos- 
terior extremity, II inches. Locality, same as the preceding. 
