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“Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense cell (sc); 2, a enidoblast with enclosed nematocyst from the same specimens; 3 and 3, two forms of gland cell from the stomodaeum; 5a and 5b, epithelio-muscular cells from the tentacle in different states of contraction; 5c, an epithelio-muscular cell from the endoderm, containing a symbiotic zooxanthelia; 6, a ganglion cell from the ectoderm of the peristome.” — The Encyclopedia Britannica, 1910


The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)II:98


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