Notes on Cincinnatian Fossil Types 
303 
(Bull. 92, U. S. Nat. Mus. Vol. 2, p. 1213, 1915) lists the Leipers 
form as the holotype. 
The Richmond specimens mentioned in the original description 
were obtained at three localities: Upper Richmond, near Lebanon, 
Ky.; top of Cincinnati Group, 18 miles east of Louisville, Ky.; and 
Upper Richmond, eastern part of Jefferson county, Kentucky. 
In the area west of the Cincinnati geanticline in Kentucky, 
Stromatocerium is known at only two horizons in the Richmond. 
One of these is at the top of the Saluda member, but below the Hitz 
layer, when the latter is present. The second horizon includes 
the great coral reef at the base of the Liberty member, and extends 
from a short distance below this reef to a short distance above the 
latter. There is no reason why Stromatocerium should not occur also 
in the Coral reef in the lower part of the Waynesville member, since 
it is usually associated with one or more species of the massive corals, 
and is known to occur as low as the base of the middle or Clarksville 
division of the Waynesville at various localities in Ohio. In south- 
central Kentucky, at various localities in Clark, Madison, and Gar- 
rard counties, Stromatocerium is found in the upper half of the Arn- 
heim, above the Dinorthis carleyi horizon; and at Wyoming, in the 
southern edge of Fleming county, it occurs at the base of the Platy- 
strophia ponderosa horizon which there appears to correspond ap- 
proximately to the position of the Mount Auburn member of the 
Maysville, if this member extends that far southeastward. As a 
matter of fact, however, Stromatocerium is unknown at present from 
any of these lower horizons in any part of the area west of the Cin- 
cinnati geanticline, in Kentucky. 
I am unable to distinguish any of the Richmond specimens of 
Stromatocerium found in any part of the area west of the Cincinnati 
geanticline, between Lebanon and Louisville, from the typical forms 
of Stromatocerium huronense, as found at the type locality, the Clay 
Cliff, south of Cape Smith, on the eastern shore of Manitoulin island. 
Even at the type locality there is great variation in the prominence 
and angularity of the mamelons, and in the distance between the 
latter. That corresponding differences are seen in the Kentucky 
specimens is indicated by the reference of specimen No 39488, from 
the Upper Richmond a mile and a half west of Lebanon, Kentucky, 
to the typical form of Stromatocerium huronense (Parks, loc. cit. p.24). 
I have often wondered, however, whether it might be possible, 
on minute examination, to distinguish the Leipers form of Stromato- 
