ON THE SPIRAL GROWTH OF THE INNER SURFACE OF THE CALCITIC SHELL, Ostrea gigas-II

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Abstract
1) Growth hills occurred on the inner surface of the Ostrea shell were a stepped pyramidal one consisting of accumulation of foliated calcite crystals, one of the rhombohedral axes of which radiated spirally or directly outwards from the top of hills and appeared to coincide with the direction of growth of individuals. 2) Crystal habit of the calcite in the Ostrea shell was similar to that of the calcite in the Anomia shell. 3) The limiting factors on crystal orientation in molluscan shells were discussed.

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