Hydractina Echinata

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“Hydractina Echinata. c, the canosarc, forming an incrustation over the object on which it lives; n, nutritive polyps; r, reproductive polyps, bearing buds in which are ova; t, tentacles.” — Galloway


Thomas Walton Galloway, Zoology A Text-Book For Secondary Schools, Normal Schools and Colleges (Philadelphia: P. Plakiston's Son & Co., 1913) 178


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