They Were Associated With Twenty-
Three Species Of Shells, Of Which Thirteen Are Recent And Four
Others Very Closely Related To Recent Forms.
[1] From the bones
of the Scelidotherium, including even the knee-cap, being
intombed 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. [2] Hence we have good evidence that the above
enumerated gigantic quadrupeds, more different from those
of the present day than the oldest of the tertiary quadrupeds
of Europe, lived whilst the sea was peopled with most
of its present inhabitants; and we have confirmed that remarkable
law so often insisted on by Mr. Lyell, namely, that
the "longevity of the species in the mammalia is upon the
whole inferior to that of the testacea." [3]
The great size of the bones of the Megatheroid animals,
including the Megatherium, Megalonyx, Scelidotherium, and
Mylodon, is truly wonderful. The habits of life of these
animals were a complete puzzle to naturalists, until Professor
Owen [4] solved the problem with remarkable ingenuity. The
teeth indicate, by their simple structure, that these Megatheroid
animals lived on vegetable food, and probably on the
leaves and small twigs of trees; their ponderous forms and
great strong curved claws seem so little adapted for locomotion,
that some eminent naturalists have actually believed,
that, like the sloths, to which they are intimately related,
they subsisted by climbing back downwards on trees, and
feeding on the leaves.
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