488 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 granulijer is so 

 abundant as to form almost solid masses in the Ames but was not 

 discovered in the Cambridge. On the other hand, Chonetes 

 verneuilanns 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'^, 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 granulijer , 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 Moi-gantown, 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. Suiv. County li.|it., 1906, p. IL'7. 

 Ohio State University. 



