Preliminary Notes on Cincinnatian and Lexington Fossils 303 
the Hanging Rock road, at Madison, Indiana, a specimen was 
found about 7 feet above the chief Columnaria bed, in sandy 
layers, associated with Rhynchotrema capax, Strophomena sulcata 
and Streptelasma. Two specimens were found a little over two 
miles south of Versailles, Indiana, opposite the home of Porter 
Harper, 65 feet below the base of the Clinton, immediately below 
the Tetradium horizon, in strata regarded as forming the base of 
the Saluda bed. Several specimens were found also a mile and a 
half northeast of Osgood, Indiana, in the lower part of the Tetra- 
dium minus bed, associated with numerous specimens of Colum- 
naria alveolata, some of Calapcecia cribriformis, and the same 
forms of Byssonychia as those found in the T etradium layer oppo- 
site the home of Porter Harper. 
Heterospongia, sp. 
{Plate IX, Fig. 2.) 
The distinguishing features of Heterospongia knotti are the 
presence of oscula, scattered over the surface at intervals of 8 to 
20 millimeters, and the relatively small apertures between the 
meshes of sponge fibers, about 6 to 8 in a length of 5 millimeters. 
These apertures tend to be rounded instead of roughly angular. 
In other respects this species closely resembles Heterospongia 
suhramosa, a much more common species. 
The specimen here figured appears to have poor indications of 
oscula and appears more closely related to Heterospongia knotti 
than to ILeterospongia suhramosa. It was found southeast of 
Lebanon, Kentucky. The types of Heterospongia knotti were 
found near Lebanon, Kentucky, but their exact horizon has not 
been determined. Heterospongia is found here both in the 
Liberty bed and in the upper part of the Maysville formation, in 
strata belonging below the Dinorthis carleyi horizon. All of the 
specimen found in situ belonged to the species Heterospongia 
suhramosa. 
Pasceolus darwini, Miller. 
{Plate VIII, Fig. I, A, B.) 
Body spherical, consisting of a covering of polygonal plates, 
chieflj/ hexagonal, surrounding a body cavity at present filled with 
