They were associated with twenty-three species of shells, of which thirteen are recent and four others very closely related to recent forms.

(5/1.

Since this was written, M.Alcide d'Orbigny has examined these shells, and pronounces them all to be recent.) From the bones of the Scelidotherium, including even the kneecap, being entombed in their proper relative positions, and from the osseous armour of the great armadillo-like animal being so well preserved, together with the bones of one of its legs, we may feel assured that these remains were fresh and united by their ligaments, when deposited in the gravel together with the shells.

(5/2.

M.Aug.
Bravard has described, in a Spanish work "Observaciones Geologicas" 1857, this district, and he believes that the bones of the extinct mammals were washed out of the underlying Pampean deposit, and subsequently became embedded with the still existing shells; but I am not convinced by his remarks.