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Then the young Crania adhered to the bared shell, grew and perished in its turn; after which the upper valve was separated from the lower before the Ananchytes became enveloped in chalky mud. Fossil and recent wood drilled by perforating Mollusca. Fossil wood from London Clay, bored by Teredina. b. Recent wood bored by Toredo. d. Shell and tube of Teredo navalis, from the same. c.
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