90 EDENTATA. 



19952. A middle dorsal vertebra ; from Lujan. Purchased, 1846. 



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



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



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

 the series ; from Lujan. The corresponding vertebrae of the 

 skeleton are cast from this specimen. Purchased, 1846. 



19953 r. Twelve associated caudal vertebrae and detached chevron 

 bones ; from Lujan. Purchased, 1846. 



19953m'. 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 hy D. A. Stoddart, Esq., 1865. 



16404. A first rib ; from Uruguay. 



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



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



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

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

 scapula, humerus, elements of the innominate, femur, 

 tibia, and ungual phalangeal ; from the Eio Plata. 



Bravard Collection. Purchased, 1854. 



Megatherium mirabile, Leidy\ 



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

 ters have not yet been made clear. 



Hah. 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. americanus, and 

 shows structural diiferences which are certainly of specific 

 value. Hastings Collection. Purchased, 1855. 



Megatherium lundi, H. Gervais & Amcghino ^. 



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

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

 from which it is said to differ in form. 



Hah. South America (Argentine llepublic). 



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



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



^ 'Maramiieres Fossiles de rAmerique Meridionale,' p. 138 (1880). 



I 



