EXTINCT MAMMALIA OF NORTH AMERICA. 413 



concave, and inclines postero-internally. 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. 

 Megalocnns rodens. 



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



PL Figs. 3, 4. 

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

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

 Myomorphus cubensis, Pomel : Comptes Rendus, September 28, 1868, LXVII, 665-668, fide An. 



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

 Megalonyx {Myomorphus) cubensis, Pomel : Ibidem. 



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

 Quaternary. 



EREPTODON. 

 Ereptodon prisons. 



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. Brona : Leth. Geog. Ill, 1853-6, 1011. 

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



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



MYLODON. 



Mylodon Harlani. 



Megalonyx laqueatiis, Harlau : Month. Am. Jour. Geol. 1831, 74, PL III, Figs. 1 — 3 ; Edinb. New 

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

 See. Penn. 1835, 67 ; Am. Jour. Sc. 1842, XLIII, 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, XL VI, 323. 



Mylodoti Ilarlani, Oviea: 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- 

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

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

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



Orycterotherlum 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. Mi^soiiriensu, Perkins : Bost. 

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



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



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

 249? 



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

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



