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Most of the erect and prostrate trees had become hollow shells of bark before they were finally embedded, and their wood had broken into cubical pieces of mineral charcoal. Land-snails and galley-worms Xylobius crept into them, and they became dens, or traps, for reptiles. Large quantities of mineral charcoal occur on the surface of all the large beds of coal.
Dawson to be capable of walking and running on land. Xylobius Sigillariae, Dawson. Coal, Nova Scotia. a. Natural size. b. Anterior part, magnified. c. Pupa vetusta, Dawson. a. Natural size. b.
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