Philadelphia, February 5, 1874. 

 Prof. J. S. Newberry, Director of the Oeological Survey of Ohio : 



Sir : I send, at your request, the report which I have prepared for the use of the 

 Geological Survey of Ohio on the extinct air-breathing vertebrata of the Coal Meas- 

 ures of your State. Hoping that you may find it adapted to your purpose, and that 

 the influence of your position will continue to advance this interesting department 



of palseontological science, 



I remain, with respect, 



Edward D. Cotb. 



