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"Epidermo-muscular cells of Hydra m, muscular-fiber processes." — Encyclopedia Britannica, 1893

Epiderm Cels

"Epidermo-muscular cells of Hydra m, muscular-fiber processes." — Encyclopedia Britannica, 1893

"Muscular cells of medusae (Lizzia). The uppermost is a purely muscular cell from the sub-umbrella; the two lower are epidermo-muscular cells from the base of a tentacle; the upstanding nucloated portion forms part of the epidermal mosaic on the free surface of the body." — Encyclopedia Britannica, 1893

Muscular Cells

"Muscular cells of medusae (Lizzia). The uppermost is a purely muscular cell from the sub-umbrella;…