326 



PALAEONTOLOGY OF NEW-YOKK. 



BRACHIOPOM OF THE CORALLINE LIMESTONE. 

 682. 31. ORTHIS INTERSTRIATA {n. sp.). 



Pi. LXXIV. Figs. 1 a, h, and 2 a, b. 



Semiova], 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 strife as if regularly dichotomous ; concentrically marked by rather strong striee. 



This shell, in its dorsal valve, has much the aspect of 0. fesfudinaria, 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 strias. 



Fig. 1 b. The stri© etilarged. 



Fig. 2 a. The dorsal valve of a smaller specimen. 



Fig. 2 b. The surface enlarged, showing the interstitial stris. 



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 striffi 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 Schohaaie. 



(^Collection of John Gebhasd junior.) 



684. 28. LEPT^NA 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. 



