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PLATE VII.

PLUMATELLA CORALLOIDES and PLUMATELLA EMARGINATA.

Plumatella coralloides, growing upon a piece of submerged timber.
Portion of the same magnified.

Base of a branch of P. coralloides, with an imperfect septum.
Statoblast of P. coralloides.

Natural size.

Plumatella emarginata, creeping over the surface of a submerged stone. Natural size.
Some of the statoblasts are seen adhering, in rows, to the stone.

Portion of the same magnified.

Free statoblast of P. emarginata.

Adherent statoblast of the same.

A row of adherent statoblasts, with the unorganized cement which attaches them to the walls of the cell.

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