Field Museum of Natural History. 



Publication 171. 



Geological Series. Vol. IV, No. 3. 



NEW TRILOBITES FROM THE 



MAQUOKETA BEDS OF 



FAYETTE COUNTY, IOWA 



By 



Arthur Ware Slocom, 

 Assistant Curator, Section of Invertebrate Paleontology. 



Oliver Cummings Farrington, 

 Curator, Department of Geology. 



Chicago, U. S. A. 

 October, 19 13. 



