172 PALEONTOLOGY OF NEW YORK. 



shows a broad central elevation, corresponding to the muscular impressions, 

 and converging ridges over the pallial region, representing the vascular 

 sinuses. Fine radiating lines are also .visible over the anterior region. 

 Length of the valve, 12 mm., greatest width, 8 mm. 



Chemung group. Alleghany counUj, N. Y. 



LlNGULA FLABELLULA, Sp. nOV. 

 PLATE I, FIGS. 33, 34. 



Shell large, subtriangular ; lateral margins diverging from an acute apex, 

 rounding broadly at about two-thirds the length of the shell, to the slightly 

 transverse anterior margin. Length to greatest width as 6 to 7. Surface 

 convex, sloping more abruptly to the sides than to the anterior margin ; 

 covered with low, rather taint and distant concentric lines or wrinkles. Shell- 

 substance comparatively thick, showing fine radiating lines on the inner 

 laminae. Length of the largest specimen observed, 42 mm., greatest width, 

 36 mm. 



Waverly group. Scioloville and Beren, Ohio. 



LiNGULA PABACLETUS, .Sp. nOV. 



(See page 12. tiff. 8.) 



Shell moderately large, broadly spatulate. Posterior margins diverging from 

 an acute beak, rounding slowly to tlie sides of the shell where the curve is 

 less ; the interior margin is subcircular, rarely transverse. The greatest 

 width of the shell is in front of the middle and the proportions of length to 

 greatest width are as 2 to 1.3. Surface ornamented with distant, concentric 

 wrinkles between which are exceedingly fine concentric striae. On the in- 

 terior tlie valves have a notably broad margin of contact. The internal cast 

 sometimes shows this to he broadest at the middle of the anterior margin; 

 faint radiating striae are also observable on this cast. The muscular and 

 vascular impressions of the interior are frequently well defined, as described 

 on the page above cited. Length of the original specimen, 16 mm., width, 

 1 1 mm. 



Waverly group. Cui/ahoga shales, Chardon, Ohio. 



