326 



PALEONTOLOGY OF MEW-VORK. 



BRACHIOPODA OF THE CORALLINE LLMESTONE. 

 682. 31. CRTHIS 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 fiat ; stria; 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 striE. 



This shell, in its dorsal valve, has much the aspect of 0. festudinaria, but the strice are 

 stronger and not arcuate ; the concentric lines also are stronger th?n in that species. It is com- 

 paratively rare in this limestone, and, so far as known, restricted to it. 



Fig. 1 a. The inlcrior of the ventral valve, showing regularly dichotomous strite. 



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 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 Schohajie. 



{Collection of ^oHS Gebhard junior.) 



684. 28. LEPTiENA BIPARTITA {n. sp.). 



PL. LXXIV. Fig. 4 o, 6, and 5 o. 



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. 



