406 EXTINCT MAMMALIA OF NORTH AMERICA. 



Hall (Bost. Jour. Nat. Hist. 1847, 391,) and Wyman (Am. Jour. Sc. 1850, 64,) 

 also report the discovery of remains near Natchez, Mississippi, and in Louisiana. 



Recently a skull was submitted to the inspection of the author which was found 

 in ploughing a field near Charleston, Coles County, Illinois. Quaternary, 



PALiEOCASTOR. 

 Paleeooastor nebrascensis. 



See page 338, PI. XXVI, Figs. 7-11. 

 Sieneofiber Nebrascensis, Leidj : Proc. Ac. Nat. Sc. 1856, 89 ; 1857, 89. 

 Chalicornys Nebrascensis, Leidy : Proc. Ac. Nat. Sc. 1857, 176. 



From the Mauvaises Terres of White River, Dakota. Miocene. 



PSEUD OSTOMIDjE. 



GEOMYS. 

 Geomys bnrsarins. 



Pseudostonia bursarius, Leidy ; Trans. Am. Phil. Soc. 1857, XI, 18 ; in Hall and Whitney's Rep. 



Geol. Surv. Wise, and Whitney's do. Up. Missis. Lead Region, 1862, 424. 

 Geomys bursarius, Leidy : Proc. Ac. Nat. Sc. 1867, 97. 



Teeth found in association with remains of Pkdi/gonus in crevices of the lead- 

 bearing rocks near Galena, Illinois. An entire skull, thoroughly petrified, found in 

 association with remains of Masiodoti and Elephant in the loess at the mouth of the 

 Platte River, Nebraska. 



ARVICOLWM 



ARVICOLA. 



Arvicola riparia? 



Arvicola, Leidy : Trans. Am. Phil. Soc. 1857, XI, 18 ; Hall and Whitney's Rep. Geol. Wisconsin 

 and Whitney's do. Up. Missis. Lead Region, 1862, 424. 



Teeth of an Arvicola about the size of those of the living A. riparia were found in 

 association with remains of Platygonus, in the same condition of preservation, in 

 crevices of the lead-bearing rocks near Galena, Illinois. 



FIBER. 

 Fiber zibethicns. 



Muskrat, Holmes : Proc. Am. As. Adv. Sc. 1850, III, 201. 



Fiber zibethicm, Leidy : Holmes' Post-pliocene Fossils of South Carolina, 1860, 113, PL XXII, 

 Figs. 2-4. 



Remains found in association with those of Mastodon and other extinct animals in 

 the post-pliocene formation on the Ashley River, near Charleston, South Carolina. 

 Also found with Mastodon remains in New Jersey. 



