Field Columbian Museum 



Publication 34. 



Geological Series. Vol. I, No. 4. 



THE MYLAGAULID^: 



AN EXTINCT FAMILY OF SCIUROMORPH 



RODENTS 



BY 



Elmer S. Riggs, A.M., 



ASSISTANT CURATOR, DEPARTMENT OF GEOLOGY. 



Oliver Cummings Farrington, Ph.D., 



CURATOR, DEPARTMENT OF GEOLOGY. 



Chicago, U. S. A. 

 March, 1899. 



