326 Eeport of the State Geologist. 



Lingula scutella. 



Plate 1, fig. 8. 



Lingula scutella, Hall. Palaeontology of N. Y., vol. VIII, pt. 1, p. 171, pi. i, 

 fig. 30. 1892. 



Shell broad, subquadrate ; lateral margins parallel for a short 

 distance, but soon rounding to the extremities, which have about 

 «qual curvature. Length to width as 2 to 3. Surface covered 

 with more or less distinct concentric lines and wrinkles. The 

 interior of the original valve, a cast of the interior, shows a broad 

 <5entral elevation, corresponding to the muscular impressions, and 

 converging ridges over the pallial region, representing the vascu- 

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

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



Chemung group. Allegany county^ N. Y. 



Lingula (Glossina) flabellula. 



Plate 1, figs. 5, 6. 



Lingula flabellula, Hall. Palaeontology of N. Y., vol. VIII, pt. 1, p. 173, pi. i, 

 figs. 33, 34. 1892. 



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 faint 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. Sciotoville and Berea^ Ohio. 



Lingula paracletus. 



Lingula paracletus, Hall. Palaeontology of N. Y., vol. VIII, pt. 1, p. 172, see 

 p. 12, fig. 8. 1892. 



Shell moderately large, broadly spatulate. Posterior margins 

 diverging from, an acute beak, rounding slowly to the sides of 

 the shell where the curve is less ; the interior margin is subcircu- 

 lar, 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. 



