45 2 
The Ohio Naturalist. 
[Vol. XII, No. 3, 
tocerium is present in the Mount Auburn bed. In southern 
Kentucky, along the Cumberland river, it occurred already 
during the upper Fairmount, often in great numbers. During 
the deposition of the Waynesville and later deposits of the Rich- 
mond, the species has a much wider geographical distribution. 
In the table of Cincinnatian strata, the term Laughery is used 
to include the Waynesville and Liberty members of the Richmond, 
the Saluda being regarded as deposited during one of the more 
important diastrophic movements during this period. The typical 
exposures occur along the Laughery creek, in Ripley county, from 
the vicinity of Versailles to Osgood, Indiana. 
On the accompanying charts, the letters designate the localities 
at which the writer found the species in question. The letters 
have the following signification: 
D — Dinorthis carleyi. 
R — Rhynchotrema dentata — arnheimensis. 
L — Lcptaena richmondensis — precursor. 
P — Platystrophia ponderosa. 
A — Dalmanella jugosa, var. 
S — Stromatocerium huronense. 
Platystrophia and Leptaena occur also 10 miles south of the 
southern margin of the area covered by these charts, in Adair 
county, Kentucky, as indicated by the direction of the small 
arrow on the charts. (See plates XX, XXL) 
