172 
PALAEONTOLOGY 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 county, N. Y. 
Lingula flabellula, sp. nov. 
PLATE I, FIGS. 33, 34. 
Shell large, sub triangular; 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, sp. nov. 
(See page 12, fig. 8.) 
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 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 the valves have a notably broad margin of contact. The internal cast 
sometimes shows this to be 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, 
11 mm. 
Waverly group. Cuyahoga shales, Chardon, Ohio. 
