CHEMUNG GROUP. 
265 
4. Pecten cancellatus, n. s. — Obliquely ovate; ears small, distinct, posterior one rather 
strongly plicated; (left valve) surface evenly cancellated by fine radiating and concentric 
lines. 
In form this shell resembles the last, but the striae are more even, and never rugose; the 
form of the posterior wing is likewise different. 
Locality —Phillipsburgh, Allegany county. 
5. Avicula? signata, n. s. — Obliquely sub-ovate ; ears small, distinct, posterior one acute ; 
surface marked by sharp concentric lines or lamellae, which give the shell a peculiar aspect. 
Locality —Rockville, Allegany county. 
6. Pecten? convexus, n. s. — Orbicular, very convex; beak much elevated above the hinge 
line; surface marked by radiating striae, which are crossed by concentric undulating lines, 
giving the shell a very pretty appearance. 
This fossil is readily distinguished by its great convexity and orbicular form. 
Locality —Rockville, Allegany county. 
7. Pecten striatus, n. s. — Erect, ovate ; ears small, nearly equal; shell moderately con¬ 
vex, surface finely and evenly covered with radiating striae. 
This differs from all the others in the fine, even, radiating striae. 
Locality —Painted-post, Steuben county, in brownish sandstone. 
8. Pecten? crenulatus, n. s. —- Obliquely sub-ovate; posterior wing extending down the 
side of the shell more than half way to the base ; anterior wing short; hinge line crenulated ; 
surface of the shell faintly marked by obsolete, radiating and concentric lines. 
Locality —Rockville, Allegany county. 
9. Pecten? dolabriformis. — Obliquely suborbicular, moderately convex; ears small, pos¬ 
terior one sharply angulated; beak a little elevated above the hinge line ; surface marked by 
fine radiating and concentric striae. 
This shell somewhat resembles No. 6, but is much less convex, more oblique, and the pro¬ 
portion of the ears different. 
Locality —Phillipsburgh, Allegany county. 
10. Lima glaber, n. s.— Erect, oblong-ovate; hinge line very short; ears small; shell 
very glabrous, with a few concentric, scarcely visible undulations. 
The distinguishing character of this shell is its elongated form, its narrowness just below 
the hinge line, and the very glabrous surface. 
Locality —Phillipsburgh, Allegany county. 
11. Lima 1 obsoleta. — Somewhat obliquely ovate ; slightly convex; surface faintly marked 
by concentric lines, which are stronger upon the ears ; hinge line crenulated. This fossil is 
referred, with doubt, to the genus Lima, the hinge being crenulated. 
Locality —Phillipsburgh, Allegany county. 
[Geol. 4th Dist.J 34 
