28 UNIVERSITY OF MISSOURI BULLETIN 



from the fossils is negative, there seems to be no good reason for 

 placing the dividing line at this contact. In as far as strati- 

 graphic relations are concerned, the line would be drawn more 

 appropriately at the contact of the Bedford and overlying 

 Berea. Newberry's reference of the Bedford to the Mississipp- 

 ian on the basis of fossils lacks corroborative evidence. Herrick 

 failed to find the Mississippian forms and in five years collect- 

 ing the writer has failed to find a fossil of any kind above the 

 Bedford-Ohio contact. The faunas collected by Herrick are 

 of Devonian aspect. 



CONCLUSIONS 



West of Elyria, Ohio, the Ohio shales do not show distinct 

 three-fold division. 



West of Elyria the Ohio shales have a distinctly Devonian 

 fauna at the top and must be classed as Upper Devonian. 



The Bedford shale has its closest relationship with the 

 Devonian and should probably be classed as Devonian. 



VERTEBRATE REMAINS 



Stenosteus pertenuis, sp. nov. (Plate I, figs. 8, 10, 11) 



Types one almost perfect mandible and one fragmentary 

 mandible. Mandible 65 mm. in length, 11 mm. wide near the 

 posterior end, 6 mm. wide at the narrowest part which is near 

 the anterior end, 8 mm. wide at the symphysis. The posterior 

 part is a little more than one millimeter thick and the thickest 

 part which is near the anterior end is not more than two milli- 

 meters. Denticles are crowded on the top for two centimeters 

 beginning one centimeter back of the symphysis. Back of this 

 they decrease in size, are irregular in distribution, and merge 

 so gradually with the bone that it is difficult to determine where 

 they disappear. They extend for at least two-fifths the length 

 of the mandible. For one centimeter from the symphysis no 

 denticles can be determined. Lines indicating the bony lamellae 



