74 R. P. Stevens on the Coal Measures of Ohio and Illinois. 
cies of this shale. From the mines of Mahoning and Summit 
o., Ohio, even from limited examinations, he has en 
ated 41 genera with 150 species. Of these, the following are 
characteristic of this shale. The beautiful Whittleseyea elegans, 
henopteris Lesquereuxii, 8. Kirtlandii, 8. simplex, S. parviflora, 
S. uncinaia, Alethopteris grandiflora, Neuropteris lancifera. The 
Alethopteris Lonchitidis and Pecopteris plumosa he considers iden- 
tical with Huropean species. 
e equivalent shale in Indiana and Illinois, over seam of 
coal No. 1, on the Wabash and at Morriss, Ill., is also exceed- 
ingly rich in its flora. 
Ind., and Morriss, Ill. 
__ According to T. A. Conrad, Esq., the iron-stone layers of Coal- 
brook, England, and of Tioga Co., Pa., have Productus scabriculus 
as a characteristic fossil. The same fossil is found in similar 
positions, in McKean Co., Pa., Mahoning Co., Ohio, and in 
esi 
