58 GRAVIGRADA. 



GNATHOPSIS, Leidy. 



Dentes discreti ; inferiores autici elliptici ; secundi et tertii ovati. 



4 — 4 



1. G-nathopsis Oweni, Leidy. — Hab. America meridionalis. 



Megalonyx Jeffersonii, OwEN, Zool. Beagle, Foss. Mam. 1840, 99. 

 Gnathopsis Otoeni, Leidy, Proc. Ac. Nat. Sc. Ph. YI, 1852, IIT. 



EEBPTODON, Leidy. 



Dentes discreti ? : antici ? magni, elliptici, pagina externa ? laqueata. 



4 — 4 



1. Ereptodon priscus, Leidy. — Hab. America septentrionalis. Mississippi. 

 Proc. Ac. Nat. Sc. Ph. VI, 1853, 241.— Ib. Anc. Fauna of Nebr. 10. 



MYLODON, Owen. 



Dentes discreti ; superiores antici subelliptici, e reliquis modice remoti ; secundi ellip- 



tici ; reliqui trigoni, pagina interna sulcata ; inferiores antici elliptici ; penultimi tetragoni ; 

 ultimi maximi, bilobati. Pedes sequales : raanibus pentadactylis et pedibus tetradactylis. 

 Falculse magnse, semiconicse, insequales. 



Caput femoris ligamento rotundo impressum. Tibia et fibula discretse. — Owen. 



1. Mylodon Dar-winii, Owen. — Maxilla inferior sympbyse longiore, angustiore; 



molares secundi subelliptici ; ultimi bisulcati, sulco interno angulari. — Otven. 

 Hab. America meridionalis. 



Glossotherium, Owen, Zool. Beagle, Foss. Mam. 1840, 5T. 



Mylodon Darwinii, Owen, Ibid. 68. — Ib. Mem. on the Mylodon, 1842, 154. 



2. Mylodon Harlani, Owen. — Maxilla inferior symphyse breviore, latiore ; molares 



secundi subquadrati; ultimi trisulcati, sulco interno bi-angulari. — Owen. Hab. 

 America septentrionalis. Kentucky, Mississippi, Missouri, Carolina meridionalis, 

 Oregon. 



Megalonyx laqueatus, Haelan, Med. and Phys. Res. 1835, 334, PL xv. Fig. 2-4. 

 Mylodon Harlani, Owen, Zool. Beagle, Foss. Mam. 1840, 68. — Ib. Mem. on the 



Mylodon, 1842, 15. 

 Orycterotkerium Missouriense, Haklan, Proc. Am. PHI. Soc. II, 1841, 119. — Is. 



Am. Journ. Sci. and Arts, XLIV, 1843, PL 1— iii. 

 Mylodon seu Megalonyx? Perkins, Am. Journ. Sci. and Arts, XLII, 1842, 136, 



Fig. 1-4. 

 Orycterotherium Oregonense, PERKINS, Am. Journ. Sci. and Arts, XLIV, 1843, 80. 

 Eubradys antiqims, Leidy, Proc. Ac. Nat. Sc. Ph. VI, 1853, 241.— Ib. Anc. Pauu. 



of Nebr. 10. 

 Megalonyx potens, Leidy (Srrore typograph. in Anc. Faun. Nehr. 10, sub Euhrad. 



antiq. posiius). 



3. Mylodon robustus, Owen. — Maxilla inferior symphyse breviore, latiore; molares 



secundi subtrigoni ; ultimi trisulcati, sulco interno rotundato. — Owen. Hab. 

 America meridionalis. 



Mylodon robustus, Owen, Mem. on the Mylodon, 1842. 



