LETTER OF TRANSMITTAL. 



Stanford Univeksity, Cal., May 17, 1901. 



Sir: I have the honor to transmit herewith the manuscript and draw- 

 ings for a paper entitled The Carboniferous Ammonoids of America, in 

 which fill the Carboniferous ammonoid genera and species known in 

 America are listed, described, and, where possible, figured. 



A phylogenic classification of the Paleozoic ammonoids is attempted, 

 which, it is hoped, will prove useful to students of systematic paleontology. 

 Ver}^ respectfully, 



James Perrin Smith. 

 Hon. Charles D. Walcott, 



Director United States Geological Survey. 



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