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PLUMATELLA CORALLOJDES and PLUMATELLA EMARGINATA.
Plumatella coralloides, growing upon a piece of submerged timber. Natural size. 2. Portion of the same magnified. 3. Base of a branch of P. coralloides, with an imperfect septum. 4. Statoblast of P. coralloides. 5. Plumatella emarginata, creeping over the surface of a submerged stone .
Natural size. Some of the statoblasts are seen adhering, in rows, to the stone. 6. Portion of the same magnified. 7, 8. Free statoblast of P. emarginata. 9. Adherent statoblast of the same. 10. A row of adherent statoblasts, with the unorganized cement which attaches them to
the walls of the cell.