Notes on Cincinnatian Fossil Types 
301 
\ 
sometimes shown by the papillae on the surface of the mamellate 
elevations, • 
13. Stromatocerium montiferum, Ulrich 
{Plate II . Fig. 1) 
1886. Labechia montifera Ulrich, Contr. to Amer. Pal., 1, p. 33, Fig. also Figs. 9 
and 9a on plate 2, from a different specimen and horizon 
The type of Labechia montifera was obtained at Madison^ 
Indiana. It consists of a thin incrustation of Stromatocerium y, 
locally 2 millimeters thick between the mamelons, elsewhere even 
thinner, growing upon a specimen of Spyroceras hammelli Foerste^ 
This species of Spyroceras is not rare in the upper part of the Saluda 
at Madison, especially in the Hitz bed, and it occurs also at the same 
horizon at the Dog Falls, west of Hanover. It occurs also in lower 
parts of the Saluda member of the Richmond at various localities 
in southeastern Indiana, and probably ranges through most of the 
Richmond, since typical specimens are not rare in the Waynesville 
member of the Richmond on Manitoulin island, in Lake Huron. 
It may be regarded as practically certain, however, that the type 
of Labechia montifera was obtained in the upper part of the Saluda 
at Madison, since thin growths of Stromatocerium often occur on 
the specimens of Spyroceras found there, and this is the only horizon 
at Madison at which Spyroceras has been found. 
The surface of the type specimen is covered with papillae, usually 
from 5 to 6 in a length of 2 millimeters, where the papillae are best 
preserved, but varying locally from as low as 4 to as high as 8 in 
the same length. The number of mamelons varies from 5 in a 
length of 20 millimeters to about 4 in the same length. Some 
parts of the incrustation are fully 2 millimeters thick in the spaces 
between the mamelons. Along one side of the specimen the mame- 
lons are low and rather indistinct, but elsewhere they are sharply 
defined. 
The type specimen bears no evidence of having been sectioned, 
but the original description is accompanied by figures of a specimen 
from Waynesville, Ohio, which present vertical and transverse 
sections of the latter. 
These sections indicate clearly that the Waynesville specimen, 
at least, can not be differentiated from typical Stromatocerium 
huronense. The occurrence of thin films of Stromatocerium on 
Spyroceras at Madison does not in itself indicate a distinct species. 
