446 GEOLOGY OF OHIO. 



showing its adult character. The type is one represented in the Devonian 

 rocks, from the Hamilton to the top of the Chemung, inclusive, in New 

 York, by several distinct species, but which is seldom recognized below 

 this horizon. We may, therefore, consider it as an additional evidence of 

 the age of the beds in which it is found. 



Formation and Locality. — In the thin shaly layers of bituminous 

 limestone, from above the "Bone-bed" at Smith and Price's quarries, 

 near Columbus, Ohio. 



