EXTINCT MAMMALIA OF NORTH AMERICA. 413 



concave, and inclines postero-internallj. Its anterior border is the most prominent ; 

 the posterior being comparatively so little prominent as not strikingly to interfere 

 with the slope of the surface. The specimen is thoroughly impregnated with bitumen. 



MEGALOCNUS. 

 Megalocnus rodens. 



Megahnyx, De Castro : De la Exist, de grandes Mamif. Fos. en la Isla de Cuba, Habana, 1865, 13, 



PL Figs. 3, 4. 

 Megahnyx rodens, Leidy : Proc. Ac. Nat. Sc. June, 1868, 180. 

 Megalocnus rodens, Leidy : Ibidem, June, 1868, 180. 

 Myomorphus cuhensis, Pomel : Comptes Eendus, September 28, 1868, LXVII, 665-668, fide An. 



Mag. Nat. Hist. 1868, II, 457. 

 Megalonyx {Myomorphus') cuhensis, Pomel : Ibidem. 



Indicated by a portion of a lower jaw found at Ciego Montero, Cienfuegos, Cuba. 

 Quaternary. 



EREPTODON. 



Ereptodon priscus. 



Leidy: Proc. Ac. Nat. Sc. 1853, 241 ; Anc. Fauna. Neb. 1853, 10; Mem. Extinct Sloth Tribe, 

 1855, 46, 58, PI. XIV, Figs. 9-11, XVI, Fig. 18. Bronn : Letli. Geog. Ill, 1853-6, 1011. 

 Ereptedon prisons, Leidy : Waile's Rep. &c. Mississippi, 1854, 286. 



Indicated by a molar tooth found near Natchez, Mississippi. Quaternary. 



MYLODON. 



Mylodon Harlani. 



Megalonyx laqueatus, Harlan : Montb. Am. Jour. Geol. 1831, 74, PI. Ill, Figs. 1 — 3 ; Edinb. New 



Phil. Jour. 1834, XVII, 358 ; Med. Phys. Res. 1835, 334, PI. XV, Figs. 2—4 ; Trans. Geol. 



Soc. Penn. 1835, 67 ; Am. Jour. Sc. 1842, XLIH, 142 ; 1843, XLIV, 72 ; XLV, 208. 

 Megalonyx, Cooper: Month. Am. Jour. Geol. 1831, 172; An. Lye. Nat. Hist. N. York 1833, III, 



166. Perkins : Am. Jour. Sc. 1842, XLII, 136. Lyell : Pr. Geol. Soc. Lond. 1843, IV, 36 ; 



Am. Jour. Sc. 1844, XLVI, 323. 

 Mylodon Harlatii, Owen : Zool. Voy. Beagle, Fos. Mam. 1840,68; Odontography, 1840-5, 335; 



Mem. on Mylodon, 1842, 15 ; Proc. Geol. Soc. Lond. 1842, III, 693 ; Amer. Jour. Sc. 1843, 



XLIV, 341. Pictet : Traite de Paleont. 1844, I, 225 ; 1853, I, 270. Geinitz : Versteiner- 



ungskunde, 1846, 27. Leidy : Anc. Fauna Neb. 1853, 10 ; Waile's Rep. Geol. Missis. 1854, 



286 ; Mem. on Sloth Tribe, 1855, 47, 58, PI. XIV, Figs. 1—3, XVI, Figs. 19, 20 ; Holmes' 



Post-plioc. Fos. S. Carol. 1860, 111, PI. XX, Fig. 7. Bronn : Lcth.Geog. 1853-6, III, 1013. 

 Oryderotherium Missouriense, Harlan : Pr. Am. Phil. Soc. 1841, II, 111, 119; Am. Jour. Sc. 1842, 



XLIII, 142 ; 1843, XLIV, 69, 79, Pis. I— III ; XLV, 210. 0. Missouriensis, Perkins : Bost. 



Jour. Nat. Hist. 1844, IV, 135. 

 Mylodon, Perkins : Am. Jour. Sc. 1842, XLII, 136, Figs. 1—4. 

 Orycteroiherium, Harlan: Am. Jour. Sc. 1842, XLII, 392. Carpenter: Amer. Jour. Sci. 1846, I, 



249? 

 Orycterotherium Oregonensk, Perkins: Am. Jour. Sc. 1842, XLII, 392 ; 1843, XLIV, note to 80 ; 



Bost. Jour. Nat. Hist. 1844, IV, 135. 



