i8 
BULLETIN OF THE LABORATORIES 
gula gannensis which greatly resembles it. That species, however, is 
much shorter and has a different surface structure. The surface in the 
present species is very finely striate and usually also possesses the 
coarser folds of growth. Length of ventral valve, 20 mm., width 10 
mm. Meek’s figure of the dorsal valve in the Ohio Palaeontology is 
slightly too oblong and not rounded enough at the front, 
' ' LINGULA MEEKI, Sp. n. 
(Plate X, Fig. 31.) 
Shell of medium size, ovate, rather attenuated toward the beak, 
greatest width near the front, lateral margins gentle curves, front a 
regular curve, beak rather prominent, general surface depressed con- 
vex, marked with the usual concentric striae. 
Length, 13 mm., width, 7.5 mm. 
Different specimens differ in the amount of attennation , of the 
beak but it cannot be certainly determined which specimens if any are 
dorsal valves. This form is somewhat abundant in the Cuyahoga val- 
ley with L. Cuyahoga, L, atra, etc. 
LINGULA WAVERLYENSIS.Sp. n. 
(Plate III, Fig. I.) 
Lingula scotica, Meek, Pal . O . toI. ii., p. 276. Cf.. L, scotica, var. nebrascensis, 
Meek, Pal. Neb., p. 156, and L. sootica, Hehrjck, Bui. Denison Univ. vol. ii., p. 144, also 
L. scotica, Davidson, Garb. Mon, p. 207, Supl. 
It is quite obvious that there are two or more forms related to the 
European L. scotica in American rocks. The coal-measure forms 
vary considerably yet apparently differ from the Waverly specimens. 
True, the latter are found in the upper third of the series and may be 
regarded as precursors of L. scotica, but they none the less need to be 
distinguished. The specimens are found in the shale above conglom- 
erate II, with Orbiculoidea pleurites with both valves in opposition. 
Shell sub-trigonal, compressed ; front margin subtruncate, round- 
ed toward the sides which are nearly straight and converge in the ven- 
trat valve at an angle of about 120° to the rather acute but not atten- 
nated beak, while the shorter dorsal valve has a bluntly rounded beak. 
