38 
BULLETIN OF THE LABORATORIES 
furrows and numerous radiating striae. Length, 8 mm., height, i6 
mm. 
Specimens from Licking and Ashland counties agree quite per- 
fectly. 
MACRODON, Sp. 
Plate XI, Fig. 28.) 
A small species resembling M. delicatus of the coal-me asures dif- 
fers from all other Waverly species in the strong radiating markings 
confined to the posterior two-thirds, while the anterior part of the shell 
is nearly devoid of them. Our specimen is too imperfect to admit of 
description as the hinge-line appears to be covered or broken away, 
but the occurrence of the species with Spirifer marionensis at Ports- 
mouth should be noted. 
CYPRICARDINIA (MIGRODON ?) SGITULA, Sp. n. 
(Plate VI, Fig. 8.) 
Shell very small, tapezoidal, highest behind, somewhat convex. 
Anterior margin short, concave, forming with the hinge an angle of 
about 120°; hinge-line straight, about two-thirds the length; posterior 
margin nearly straight, meeting the hinge at an angle of over 135°, 
abruptly curved below; lower margin slightly convex, straigthened in 
old specimens near the middle. A strong, curved ridge passes from 
the sub-terminal beak to the postero-inferior angle, middle of valve 
with a shallow sinus passing to the lower margin in old specimens. 
Surface ornamented by distant sharply, elevated, rib-like concentric 
ridges and grooves. Length of largest specimen, 10 mm., height, 5.0 
mm. Average specimen, 7 mm. long. 
CARDIOPSIS (DEXIOBIA ?) OVATA, Hall. 
(Plate IV, Fig.'^.J^ 
Dexiobia whitei^ Win. 
This species has a curious history of which our specimens do not 
permit us to attempt the concluding chapter. It was described by 
Prof. Hall in his Iowa report from the Kinderhook group at Burling- 
