. Dwellers of the sea and shore . THE MASON WORM. methods of the tube-building mason worm, which con- structs its house of agglutinated shell and mineral frag- ments, and the comb worm, which cements grains of sand together in mosaic fashion to make its free cone- shaped shelter, manufactures its ow^n materials. The structure is a frail tenement, but one of imposing excel- lence. It is a calcareous tube, winding about over small stones or dead shells, and is, by some mysterious chem- istry of the worm's body, converted from the com- pounds of the sea.

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Keywords: ., bookcentury1900, bookpublishernewyorkt, booksubjectmarineanimals