MEGATHEEIIDJil. 107 



Yoyage of the Beagle,' pt. 1, p. 68, pi. xvii. figs. 3, 4 .^ 

 and Leidy in the ' Smiths. Contrib. Knowl.' vii. art. 5,. p.47, 

 pi. xiv. figs. 1,2, the teeth being figured in pi. xvi. fig. 19 

 of the latter memoir. 



Mantell Collection. Purchased, 1836. 



40853. The terminal phalangeal of a lateral digit ; from the Pleis- 

 tocene of Skiddaway, near Savannah, Georgia. 



Presented by C. Falconer, Esq., 1867. 



Mylodon robustus, Owen \ 



This species is about one third smaller than Megatherium ameri- 

 canum. The interval between the first and second teeth is com- 

 paratively small, and the plane of wear of these teeth horizontal ; 

 the length of the last lower tooth is moderate, and the palate of 

 great relative width. 



Hah. South America (Argentine Eepublic and Uruguay). 



40483. The cranium, wanting both zygomatic arches, and with some 

 of the teeth imperfect ; from the Pleistocene of Gutierrez, 

 near Paysandu, Uruguay. This specimen agrees precisely 

 with the type cranium figured by Owen, op. cit. pis. ii.-iv. 

 The length inferiorly is 0,436. 



Presented by W. G. Lettsom, Esq., 1867. 



M. 3591 b. Cast of the right astragalus. The original (which is 

 figured in De Blainville's * Osteographie,' Genus Mega- 

 therium, pi. iii. fig. 18) was obtained from the Argentine 

 Republic, and is in the Muse am of the Eoyal CoUege of 

 Surgeons. 

 Presented by the Council of the Royal College of Surgeons. 



The following specimens are provisionally referred to this species^ 

 but some of them may belong to M. lettsomi. 



40489. The left humerus, imperfect distaUy ; from UTruguay. This 

 specimen agrees very closely with the one figured by 

 Owen, op. cit. pis. xi. & xii. 



Presented by W. G. Lettsom, Esq., 1867. 



40154. The left femur ; from the Pleistocene of Buenos Ay res, 

 Argentine E-epublic. This specimen agrees very closely 

 with the one figured by Owen, op. cit. pis. xvii. & xviii. 



Purchased, 1866. 



1 Description of the Skeleton of an Extinct Gigantic Sloth (1842). 



