SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 

 172 



PALEONTOLOGY 



OF TH1 



UPPER MISSOURI 



A REPORT UPON COLLECTIONS MADE PRINCIPALLY BY THE EXPEDITIONS UNDEE 

 COMMAND OF LIEUT. O. K. WARREN, U. 8. TOP. ENGRS., IN 1855 AND 1856. 



INVERTEBRATES. 



BY 



F. B. MEEK AND F. V. HAYDEN, M.D. 



PART I. 



ACCEPTED FOR PUBLICATION, MAT, 1864. 



