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Plumatella repens, var. a, creeping over the surface of a stone. Natural size.
Plumatella repens, var. 3, growing on a portion of a submerged stem. Natural size. . Portion of the same magnified.
A cell of P. repens, with the polypide exserted ; very much enlarged, to show anatomical details.
Extremity of the cell, with the polypide retracted. Statoblast, viewed on the face. 8. The same, viewed on the edge, and seen in section.