326 
PALAEONTOLOGY OF NEW-YORK. 
BRACHIOPODA OF THE CORALLINE LIMESTONE. 
682. 31. ORTHIS INTERSTRIATA (n. sp.). 
Pl. LXXIV. Figs. 1 a, b, and 2 a, b. 
Semioval, subplano-convex; cardinal line straight, equal to the width of the shell; dorsal 
valve convex, and much elevated towards the beak ; ventral valve nearly flat; striae strong, 
not arcuate, having smaller interstitial ones commencing below the beak ; interior of shell 
showing striae as if regularly dichotomous; concentrically marked by rather strong striae. 
This shell, in its dorsal valve, has much the aspect of 0. testudinaria , but the striae are 
stronger and not arcuate ; the concentric lines also are stronger than in that species. It is com¬ 
paratively rare in this limestone, and, so far as known, restricted to it. 
Fig. 1 a. The interior of the ventral valve, showing regularly dichotomous striae. 
Fig. 1 b. The striae enlarged. 
Fig. 2 a. The dorsal valve of a smaller specimen. 
Fig. 2 b. The surface enlarged, showing the interstitial striae. 
Position and locality. In the Coralline limestone at Schoharie. 
683. 27. LEPTiENA- sp. 
Pl. LXXIV. Fig. 3 a, b. 
Semi-oval; hinge line slightly extended beyond the width of the shell. A small portion of 
the shell, preserved on the margin of our specimen, shows thin sharp radiating striae with fine 
concentric striae between them ; the other portion of the specimen [preserves only the direction 
of the striae, and the punctate surface of the interior. 
From the imperfect condition of the two specimens examined, it is difficult to characterize 
with accuracy the shell in its perfect state. 
Fig. 3 a. A specimen showing the form of the shell. 
Fig. 3 b. An enlargement, showing the thin radii and connecting concentric lines. 
Position and locality. In the Coralline limestone at Schoharie. 
{ Collection of John Gebhabd junior.) 
684. 28. LEPTiENA BIPARTITA (n. sp.). 
Pl. LXXIV. Fig. 4 a, b, and 5 a. 
Shell elongated, semioval; dorsal valve nearly flat, ventral valve slightly concave; surface 
with strong radiating striae and intermediate finer ones; interior surface entirely punctate ; 
dorsal valve with the muscular impression much elongated and distinctly bipartite. 
