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PLATE WI.

PLUMATELLA JUGALIS and PLUMATELLA FRUTICOSA.

Fig.

1. Plumatella jugalis, attached to the under surface of a floating leaf of Sagittaria sa/i//ifolia. Natural size.

The same magnified.

Plumatella fruticosa, attached to the petiole of Sagittaria. Natural size.

Portion of the same magnified.

Statoblast of P. fruticosa.

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PLATE VII.

PLUMATELLA coPALLOI DEs and PLUMATELLA EMARGINATA.

Plumatella coralloides, growing upon a piece of submerged timber. Natural size.
Portion of the same magnified.
Base of a branch of P. coralloides, with an imperfect septum.
Statoblast of P. coralloides.
Plumatella emaryinata, 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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