The extinct species of large terrestrial Sloth, indicated by the above name, was first made known by portions of its fossil skeleton having been discovered by Charles Darwin, Esq., F. R. S., at Punta Alta, Northern Patagonia. These portions were described by the author in the Appendix to the 'Natural History of the Voyage of H. M. S. Beagle'. The subsequent acquisition by the British Museum of the collection of Fossil Mammalia brought from Buenos Ayres by M. Bravard, has given further evidence of the generic distinction of the Scelidothere, and has supplied important characters of the osseous system, and especially of the skull, which the fragments from the hard consolidated gravel of Punta Alta did not afford.
I. On the scelidothere (
scelidotherium, leptocephalum
, Owen), a large extinct terrestrial sloth
