90 EDENTATA. 



19952. A middle dorsal vertebra ; from Lujan. Purchased, 184G. 



39390. A late dorsal vertebra ; from the Rio Negro. 



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



19953 k'. The associated caudal vertebra), wanting the first two of 

 the series ; from Lujan. The corresponding vertebrae of the 

 skeleton are cast from this specimen. Purchased, 1846. 



19953 1'. Twelve associated caudal vertebrae and detached chevron 

 bones ; from Lujan. Purchased, 1846. 



19953 m'. The left clavicle ; from Lujan. Purchased, 1846. 



19953 n'. Thirteen sternal bones ; from Lujan. Purchased, 1846. 



39389. A sternal bone ; from the Rio Negro. 



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



16404. A first rib ; from Uruguay. 



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



19953 o'. Eight ribs ; from Lujan. Purchased, 1846. 



37584-625. An associated series of the bones of a fcetus, comprising 

 the occipital, frontal, numerous vertebrae, ribs, clavicle, 

 scapula, humerus, elements of the innominate, femur, 

 tibia, and ungual phalangeal ; from the Rio Plata. 



Bravard Collection. Purchased, 1854. 



Megatherium mirabile, Leidy 1 . 



This species is very imperfectly known, and its distinctive charac- 

 ters have not yet been made clear. 



Hob. North America (Georgia, South Carolina, and Texas). 



27503. A left astragalus, provisionally referred to this species ; from 

 the Pleistocene of Texas. This specimen is considerably 

 larger than the corresponding bone of M. americanm, and 

 shows structural differences which are certainly of specific 

 value. Hastings Collection. Purchased, 1855. 



Megatherium lundi, H. Gervais & Ameghino 2 . 



This species is founded on an astragalus which is less than one 

 third the dimensions of the corresponding bone of M. americanum, 

 from which it is said to differ in form. 



Ilab. South America (Argentine Republic). 

 43251 a. A left astragalus, probably belonging to this form ; from 



1 Smiths. Contrib. Knowl. vol. vii. art. 5, p. 49 (1855). 



a 'Mammiferes Fossiles de l'Am6rique Meridionale,' p. 138 (1880). 



