OF DENISON UNIVERSITY. 
17 
less convex and with a rounded inconspicuous beak ; surface marked 
by numerous rather distinct and unequal concentric lines. Length, 
16 mm: width, 10.5 mm. The epidermis is of a deep black color in 
our specimens, but this may be due to the nature of the shale. 
In form our species closely resemble L. punctata of the Hamilton 
but has very different surface characters. It needs no comparison 
with other Waverly species, being much shorter proportionally than 
either of the quadrangular species. 
Quite abundant above the juncture of the Little Cuyahoga with 
the Cuyahoga river, where it is associated with L. cuyahoga and L. 
meeki. 
LINGULA GANNENSIS.Sp. n. 
(Plate III, Fig. 2, 3.) 
Shell elliptically subquadrate, length and breadth as considerably 
less than two to one (as eleven to six); lateral margins nearly straight 
and parallel, anterior margin sub-truncate, with rounded angles ; beak 
rather acute, with a faint (internal ventral) ridge extending forward 
upon the mesial prominence ; rostral margins nearly straight. 
Ventral valve with a prominent beak, the rostral margins meeting 
at nearly a right angle ; dorsal valve rather shorter and more obtuse. 
The valves are evenly convex, slightly flattened toward the front by a 
plane which does not extend to the middle of the longer diameter. 
The surface of both valves is ornamented by numerous, sharp, con- 
centric striae. Length of ventral valve 22, breadth 12 mm. 
This species resembles in size and form Lingula punctata, H., of 
the Hamilton group but does not share its surface structure. In some 
respects L. membranacea. Win., is similar, but that species is propor- 
tionally longer and more strictly quadrate. 
From Gann, Knox Co., O., in red ferruginious band in the free- 
stone 50 feet above the river below the dam. In the freestone of the 
middle division of the Waverly near division HI. 
LINGULA MEMBRANACEA, Win. 
(Plate III, Fig. 4.) 
This species occurs about 60 feet above conglomerate H, four 
miles south-west of Loudonville. It is thus not much above our Lin- 
