SCIDRID^E— ARCTOMYS PRUIN08US. 



929 



Table CXL. — Measurcmenii of seven tkuUa of Aiictomys rnciNOSus. 



Tabi.h CXLI.— //i»( of sptcimtm examined of AncrOMYS PHU1N08U8. 



EXTINCT AMEKIOAN SClURIDiE. 



Many species of extinct Rodents have recently been made known by 

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



59 M 



