SCIUKIDyE— AECTOMYS PRUINOSUS. 



929 



Table CXL. — Measurements of seven skulls of Arctomys PRUINOSUS. 



Table CXLI.— List of specimens examined of Arctomys pruinosus. 



EXTINCT AMERICAN SCIURID^. 



Many species of extinct Rodents have recently been made known by 

 Dr. Leidy and Professors Marsh and Cope from the Tertiary deposits of 

 59 M 



