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The essential internal organization of the persistent lower forms of the zoöphyta is entirely wanting in the transitory states of the higher ones. A progress through the inferior groups is sketched out, but no actual transmutation of species is effected.
This may have been the case without regard to the origination of new species, but more probably it was otherwise; or why, for instance, should the polypiferous zoophyta be found almost exclusively in the limestones?
The whole group of the Thousand Islands, and indeed the greater part of all those whose surfaces are flat, in the neighbourhood of the equator, owe their origin to the labours of that order of marine worms which Linnaeus has arranged under the name of Zoophyta.
In this era, the forms of life which existed in the Silurian are continued: we have the same orders of marine creatures, zoophyta, polypiaria, conchifera, crustacea; but to these are added numerous fishes, some of which are of most extraordinary and surprising forms.
The animal remains are chiefly confined to the slate beds, those named from Bala, in Wales, being the most prolific. Zoophyta, polyparia, crinoidea, conchifera, and crustacea, are the orders of the animal kingdom thus found in the earliest of earth's sepulchres.
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