40 Bulletin of Laboratories of Denison University [Voi. xi, 
smooth. Some years ago, however, forms known as D. ohioense 
were found associated with D. aspectans. 
Later, specimens were found which were only partially ex- 
foliated. These show in some places characters of D. aspectans, 
and in others characters of D. hclena or D. ohioen'^e. Since D. 
aspectans was established first, this name must be retained for 
the forms under consideration. 
SUMMARY. 
This paper shows : , 
1. The species found in the Corniferous of Ohio, their 
distribution in the state, something as to their vertical range 
and variation. 
2. That the life below the bone-bed comprises two faunas. 
3. The relation between the faunas above and below the 
bone-bed and the variations found in the former. 
4. It places the central Ohio sections in their proper ver- 
tical position. 
5. That the White House fauna belongs higher in the 
Corniferous than any other fauna. 
6. That the Bellefontaine fauna is more closely related to 
that at White House than to any other. 
7. It gives some evidence bearing upon the classification 
of several common species. 
Geological Laboratory, Ohio State University, Nov., i8gj. 
