4 88 
The Ohio Naturalist. 
[Vol. IX, No. 6, 
An inspection of the preceding lists shows that many species 
are common to both horizons but there are certain noteworthy 
exceptions. Amboccelia planoconvexa is abundant in the Ames 
but was not found in the Cambridge. Chonetes granulifer is so 
abundant as to form almost solid masses in the Ames but was not 
discovered in the Cambridge. On the other hand, Chonetes 
verneuilanus is extremely abundant in the Cambridge, while no 
specimens were found in the Ames. Seminula subtilita also 
common in the Cambridge, was not discovered in the Ames. 
Other species found only in the Cambridge are: Reticularia per- 
plexa, Productus punctatus , Derbya crassa, Aviculopecten car- 
boniferus, Aviculopecten coxanus, Macrodon tenuistriata, Per- 
nopecten aviculatus and Edmondia glabra. No great importance 
is attached to this last list as only a few specimens of each species 
were found. Further search may reveal most of them in the 
Ames also. 
Whether these faunal differences are representative of general 
widespread conditions or are only local variations in faunal dis¬ 
tribution can only be determined by extensive collecting and 
thorough study. It is noteworthy, however, that faunal con¬ 
ditions are almost identical at the two collecting points in the 
Cambridge separated by a distance of more than twenty miles. 
G. P. Grimsley, in his report on the Pan Handle district of 
West Virginia 12 , gives a list of fossils from the Ames limestone 
near Morgantown, as identified by Dr. J. W. Beede, of Indiana 
University. This list includes Amboccelia planoconvexa and 
Chonetes granulifer , so abundant in the Ames but not found in 
the Cambridge where the writer collected. Furthermore, the 
several species mentioned as occurring in the Cambridge limestone 
where visited, but wanting in the Ames, are also wanting in the 
Ames list of Morgantown, West Virginia, with the exception of 
Derbya crassa and Aviculopecten carboniferus. 
The occurrence and non-occurrence of the above fossils in 
the Ames limestone at Athens, Ohio, and Morgantown, West 
Virginia, is probably more than a mere coincidence. It seems 
to indicate parallel faunal conditions at the time of deposition of 
the limestone, in the two rather widely separated regions.. 
12. W. Va. Geol. Surv. County Rept., 1908, p. 127. 
Ohio State University. 
