LETTER OF TRANSMITTAL 



Department of the Interior, 



United States Geological Survey, 

 Division of Mesozoic Invertebrates, 



Washington, D. 0., July 30, 1892. 



Sir: I have the honor to transmit herewith a memoir by Mr. T. W. 

 Stanton on the Colorado Formation and its Invertebrate Fauna, pre- 

 pared for publication as a bulletin. The work was begun by him at 

 my suggestion, and I have, as chief of the division with which he is 

 connected, been constantly cognizant of its progress. 

 Very respectfully, 



C. A. White, 



Geologist in Charge. 

 Hon. J. W. Powell, 



Director of the U. S. Geological Survey. 



