110 EDENTATA. 



Mylodon armatus (P. Gervais ^). 



Syn. Lestodon armatus, P. Gervais ^. 

 Mylodon giganteus, Burmeister ^. 

 Lestodon gig anteus, H. Gervais and Ameghino*. 



This species is nearly equal in size to Megatherium americanum ; 

 there is a long diastema between the first and second upper teeth ; 

 the plane of wear of the first tooth in either jaw is very oblique ; 

 the first upper tooth is triangular and large, and the corresponding 

 lower one nearly cylindrical and small. 



Hah. South America (Argentine Eepublic, Uruguay, and 

 Brazil). 



39377. Fragment of the occipito-parietal region of the cranium ; 

 from the Pleistocene of Uruguay. 



Presented hy D. A. Stoddart, Esq., 1865. 



The following specimens agree very closely with the limh-bones figured 

 hy P. Gervais in the ^ Mem. Soc. Geol. France,' ser. 2, vol. ix. 

 pi. xxvi., and are therefore provisionally referred to this species, 



39386. The distal extremity of the right femur ; from Uruguay. 



Presented hy D. A. Stoddart, Esq., 1865. 



39385. The left tibia ; from Uruguay. This bone is much larger 

 than the tibia of M. rohustus, its extreme length being 

 0,326. Presented hy D. A. Stoddart, Esq., 1865. 



41619. The imperfect left tibia; from Bio Grande do Sul, Brazil. 



Presented hy T. J. Tennent, Esq., 1869. 



41620. The terminal phalangeal of a median (Brd) digit ; associated 



with the preceding. 



Presented hy T. J. Tennent, Esq., 1869. 



M. 1903. The associated left tibia, calcaneum, and astragalus ; to- 

 gether with the metacarpal and phalangeals of the third 

 digit of the right manus ; and the neural arch of a dorsal 

 and the centrum of a lumbar vertebra ; from the Pleisto- 

 ' cene of the Argentine BejDublic. 



Presented hy Prof. Sir B. Owen, K.G.B., 1883. 



^ Mamraifores Fossiles de 1' Amerique Meridionale (Castelnau's Voyage), p. 47 

 (1855). — Ledodon. 

 ^ Loc. cit. 



3 An. Mas. Buenos Aires, vol. i. p. 162 (1864-69). 

 ^ Mammiferes Fossiles de rAmerique Meridionale, p. 172 (1880). 



