EXTINCT MAMMALIA OF NORTH AMERICA. 407 



MURIDJE. 

 NEOTOMA. 



Neotoma magister. 



Baird : U. S. Pacific R. R. Expl. etc. VIII, 1857, 498, PI. LIII, Fig. 4. 



The species is based by Prof. Baird on specimens of lower jaws, found with other 

 animal remains, in caves near Carlisle, Pennsylvania. 



The Museum of the Academy contains the greater part of a skull and the ramus of 

 a lower jaw of a Neotoma about the size of those of iV. floridana, found with a multi- 

 tude of other bones, mostly of living species, in Durham Cave, Bucks Co., Pa. 



EUMYS. 



£iiiuys elegans. 



See page 342, PI. XXVI, Figs. 12, 13. 

 Leidy : Proe. Ac. Nat. Sc. 1856, 90 ; 1857, 89. 



Bear Creek, a tributary of the Sheyenne River, Dakota. Miocene. 



CEINCHILLIDjE. 



AMBLYRHIZA. 



Amblyrhiza innndata. 



Cope : Proc. Ac. Nat. Sc. 1868, 313. 



Indicated by remains of a large rodent from the cave deposits of Anguilla, W. I. 

 Post-pliocene. 



LOXOMYLUS. 



Loxomylus longidens. 



Cope: MS. Proc. Ac. Nat. Sc. May 4, 1869. 



Remains found in association with the preceding. 



HYSTRIGIDM 



HYSTRIX. 

 Hystrix venustus. 



See page 343, PI. XXVI, Figs. 23, 24. 

 Eystrix (Hystrieops) vetiustus, Leidy : Proc. Ac. Nat. Sc. 1858, 22. 



Sands of the Niobrara River. Pliocene. 



CAVYID^. 



HYDROCHCERUS. 



Hydrochoerus .Xsopi. 



Oyoimja ^Etsojn, Leidy ; Proc. Acad. Nat. Sci. 1853, 241. Erouu : Loth. Geog. 1856, III, 1050. 



