Field Museum of Natural History. 

 Publication 134. 

 Geological Series. Vol. IV, No. 1 



NEW ECHINOIDS FROM THE 

 RIPLEY GROUP OF MISSISSIPPI 



By 



Arthur Ware Slocom, 



Assistant Curator, Section of Invertebrate Paleontology. 



Oliver Cummings Farrington, 

 Curator, Department of Geology. 



Chicago, U. S. A. 



May 15, 1909. 



