Notes on Cincinnatian Fossil Types 
291 
irregular cavities, averaging between two and three millimeters 
in diameter. These cavities are not the openings of tubes or canals 
and, therefore, do not correspond to oscula. Both laterally and 
toward the interior they are bounded by an intricate mass of fibrous 
tissue, separating the cavities from each other. The fibrous tissue 
between the cavities averages between one-fourth and three-fourths 
of a millimeter in thickness, although frequently equalling two milli- 
meters at the angles between the cavities. This fibrous tissue is 
calcareous, and branches and anastomoses in a very irregular man- 
ner, so as to enclose smaller interspaces averaging between one- 
fourth and one-half of a millimeter in diameter, the smallest recogniz- 
able interspaces equalling scarcely one-fifth of a millimeter in diam- 
eter. Throughout the entire specimen the structure is very 
irregular. There is no central cavity, and no radiating structure 
extending from the central axis of the specimen toward the surface. 
There are no large radiate oscula at the surface, as in Dystact- 
ospongia insolens Miller. The fibrous structure resembles that of 
Heterospongia, but there are no “branching and more or less tortuous 
canals, which begin near the center, where they are nearly vertical, 
and proceed toward all portions of the surface in a curved direction,^’ 
as in Heterospongia suhramosa (Geol. Minnesota, 3, pt. 1, 1895, 
pi. G, figs. 5, 6.). There is no large gastral cavity, there are no more or 
less numerous lobes at the surface, nor basal bundles of more or 
less parallel filaments for attachment, as in Pattersonia difficilis 
Miller. The structure of the specimen here described, therefore, 
seems to be different from that of any form hitherto described from 
the vicinity of Cincinnati, and a new generic designation may 
eventually prove desirable. 
The original label has been lost, but the specimen is known to 
have been obtained at Cincinnati, Ohio, and probably was found in 
the middle part of the Maysville group. 
5. Leptopoterion faberi, Miller 
{Plate II, Fig. 2A, 2B) 
1889. Leptopoterion mammiferum Ulrich, Am. Geol., 3, pp. 239 
1889. Chir ospongia faheri Miller, N. A. Geol. Pal., p. 156, Fig. 99 
The type of Leptopoterion mammiferum was found in the Corry- 
ville division of the Maysville, in the quarries on Roh’s hill, at Cin- 
cinnati, Ohio, by Prof. Charles Schuchert, and was stated in the 
original description to be in the Ulrich collection, but it is not listed 
