Helix Descrtorun
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“Many species hibernate. The land-snails bury themselves in the ground, or conceal themselves under the back of trees, in holes in walls, or even in the stems of large umbelliferous plants. They close the mouth of the shell with a calcareous plate, technically called an epiphragm, which they secrete by means of their mantle, and which is perforated by a small hole to admit the air.” — Encyclopediia Britannica, 1893
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Snails and SlugsSource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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