400 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. 



PALyEOCASTOR. 

 Paleeocastor nebrascensis. 



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

 Stencofiber Nebrascensw, Leidy : Proc. Ac. Nat. Sc. 1856, 89 ; 1857, 89. 

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



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



PSEUD OSTOMID^. 



GEOMYS. 

 Geomys bursarius. 



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



Geol. Surv. AVisc. 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 Platygoiius in crevices of the lead- 

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

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

 Platte River, Nebraska. 



ARYICOLIDM. 



ARVICOLA. 

 Anrieola riparia? 



Arvieola, 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 Arvieola 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. 



Mushrat, Holmes : Proc. Am. As. Adv. Sc. 1860, III, 201. 



Fiber zibethiciis, J-iO-Ay : Holmes' Post-pliocene Fossils of South Carolina, 1860, 113, PI. 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. 



