South. Dakota School of Mines 127 



Rodentia. 



Castoridae. 



Eutypomys thomsoni Matthew. 

 Ischyromyidae. 



Ischyromys typus Leidy. Acad. Nat. Sci., Phila., Proc, voL 

 8, 185 6, p. 89, Mauv. Terres. 

 Muridae. 



Eumys elegans Leidy, Acad. Nat. Sci., Phila., Proc, vol 8, 

 1856, p. 9 0. Mauv. Terres. 

 Leporidae. 



Palaeolagus haydeni Leidy, Acad. Nat. Sci., Phila., Proc, 



vol. 8, 1856, pp. 89-90, Mauv. Terres. 

 Palaeolagus turgidus Cope. 

 Perissodactyla. 



Hyraeodontidae. 



Hyracodon nebrascensis Leidy. 



Hyracodon major Scott and Osborn, Mus. Comp. Zool., Bull., 

 vol. 13, 1887, p. 170. So. Dak.? 

 Amynodontidae. 



Metamynodon planifrons Scott and Osborn. Mus. Comp. 

 Zool., Bull., vol. 13, 1887, pp. 165-169. So. Dak. 

 Rhinocerotidae. 



Caenopus (Subhyracodon) occidenralis Leidy. 

 Caenopus (Subhyracodon) copei Osborn. Am. Mus. Nat. 

 Hist., Mem., vol. 1, 1898, pp. 146-150, ^Aceratherium). 

 So. Dak. 

 Caenopus (Subhyracodon) simplicidens Cope. 

 Leptaceratherium trigonodum (Osborn and Wortman). 

 "Hyracodon" planiceps Scott and Osborn. Mus. Comp. Zool., 

 Bull., vol. 13, 1887, pp. 170-171, So. Dak. 

 Lophiod'ontidae. 



Colodon (Mesotapirus) procuspidatus Osborn and Wortman. 

 Am. Mus. Nat. Hist., Butt., vol. 7, 1895, pp. 362-364. So. 

 Dak. 

 Colodon (Mesotapirus) dakotensis Osborn and Wortman. Am. 

 Mus. Nat Hist., Bull., vol. 7, 1895, pp. 362-364, So. Dak. 

 Colodon (Mesotapirus) longipes Osborn and Wortman. Am. 

 Mus. Nat. Hist., Bull., vol. 7, 1895, p. 3 66, So. Dak. 

 Tapiridae. 



Protapirus simplex Wortman and Earle, Am. Mus. Nat. Hist., 

 Bull., vol. 5, 1893, pp. 168-169. So. Dak. 

 Equidae. 



Mesohippus bairdi Leidy. 



Mesohippus obliquideus Osborn, Am. Mus. Nat. Hist., Bull., 

 vol. 20, 1904, p. 173. So. Dak. 

 Artiodactyla. 



Elotheriidae (Entelodontldae). 



Elotherium (Entelodon) mortoni Leidy. 



Elotherium (Entelodon) ingens Leidy. Acad. Nat. Sci.., 

 Phila., Proc, vol. 8, 1856, pp. 164-165. Mauv. Terres. 



