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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.
In a slab of sandstone, not more than an inch thick, the furrows or ridges of an ancient ripple may often be seen in several successive laminae to run towards different points of the compass. Successive Deposition indicated by Fossils. Limestones formed of Corals and Shells. Proofs of gradual Increase of Strata derived from Fossils. Serpula attached to Spatangus. Wood bored by Teredina.
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