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There's no denying that much of the Origin is a far-from-easy read – "..as the chelae of Crustaceans resemble in some degree the avicularia of Polyzoa, both serving as pincers, it may be worth while to show that the with the former a long series of serviceable gradations still exists..." – but it is absolutely worth the effort.

Polyzoa, pol-i-zō′a, n.pl. a class of animals forming a crust on stones, shells, &c. under water:—sing.

Flustra, flus′tra, n. one of the commonest genera of marine Polyzoa.

Fenestella, fen-es-tel′a, n. a niche on the south side of an altar, containing the piscina, and sometimes the credence: a genus of Polyzoa, like the recent 'lace coral,' very common in Pal�ozoic rocks.

Brachiopoda, brak-i-op′o-da, Brachiopods, brak′i-o-pods, n.pl. a class of shelled animals having certain affinities with worms and with Polyzoa, but less with molluscs, provided with two long arm-like processes arising from the sides of the mouth, probably respiratory, and certainly serving to waft little food particles to the mouth.