12 
BULLETIN OF THE LABORATORIES 
I. Fam. Discinid^. Upper valve sub-conical or limpet-like, lower 
flat and perforated for the pedicel. 
II. Fam. Lingulid^. Shell oblong or oval, valves nearly equal. 
L Fam. Discinid^. 
Genus i. Discina. Flat lower valve with a perforation on the 
posterior side, with an internal furrow. 
Strangely enough no well-authenticated species of Discina is yet known in the 
Ohio Waverly. From other states the following are rather imperfectly known: 
I), gallaheri^ Win. (Mich.) D. patellaris. Win. (Iowa), D. saffordi, Win. 
^Tenn). D. capax is thought a synonym of O. newberryi, and a specimen 
from Granville has been identified by Prof. Winchell with D, gallaheri perhaps 
on insufficient grounds. 
Genus 2 . Orbiculoidea. Furrow impressed from the outside 
instead of the inside the lower valve, opening at its posterior end. 
Sp 1. Orbiculoidea newberryi. h. 
Nearly circular, apex of ventral valve one fourth diameter from 
the margin, indistinct radiating markings. Less than half an inch 
in diameter. Div. I, and especially just above Berea grit. 
Sp. 2. Orbiculoidea PLEURiTES. Meek. 
Oblong elliptical, apex of ventral valve near border, depressed, 
ventral valve discoid with a deep depression posteriorly. Length 
nearly one inch. Shale over congl, 1. 
11. Fam. LiNGULiDiE. 
Genus Lingula. Characters of family. 
I 
Sp. 1. Lingula WAVERLyENSIS. Hernck (L. scotia.) 
Large species of sub-triangular form and distant raised concen- 
tric stri^. 
Sp. 2. Lingula mem bran acea. Win. 
Medium size, oblong, length to width as 12 to 6, beak rather 
acute. Above congl, II. 
Sp. 3. Lingula gannensis- Her. 
Medium size, oblong, length to width as ii to 6, beak quite 
■obtuse. Above congl. II. 
