200 FAUNA AMERICANA. 



Molars with broad crowns, marked with trans- 

 verse angular eminences. 



Zygomatic arches entire, furnished at their an- 

 terior base with a very large descending apo- 

 physis as in the sloths. 



Lower jaw having its posterior or angular rising 

 portion very broad ; and its anterior or projecting 

 portion grooved. 



Nasal bones very short ; upper maxillary bones 

 very much elongated forwards; seven cervical 

 vertebrae, sixteen dorsal, and three lumbar. Tail 

 very short, if there existed any? 



Clavicles perfect. 



Posterior extremities much more developed 

 than the anterior. Five toes to each foot, three 

 only of which are furnished with very powerful 

 hooked claws, the others rudimentary. 



Species. 



1. Megatherium cuvieri. 



Megathere, Cuvier, Magas. Encycl. an 4. De- 

 scrip, d'un squelette conserve dans le Mus. de Ma- 

 drid. Traduct. de Garriga. Cuv. Ann. du Mus. 

 torn. V. page 376. pi. 24 et. 25. Ejusd. Recherch. 

 sur les Ossemens Fossiles, 1 edit. tom. 4. Ani- 

 mal du Paraguay. Megatherium^ S. L. Mitchill, 

 Ann. of the Lyceum of Nat. Hist. New York, vol 

 i. p. 58. W. Cooper, ejusd. vol. i. p. 114. 



Char. Essent. Crowns of the molar teeth mark- 

 ed with transverse angular eminences. 



