| Summary: | The mechanism of the formation of the molluscan shell has been the subject of controversy since the first observations were made by Reaumer in 1709 on the normal growth and regeneration of shells. There is considerable agreement on the sites of secretion of the shell materiel and the histological identity of these tissues. However, controversy centres about the mechanism by which the organic matrix of the inner layers of the shell is released into the extra-pallial space, by which it is deposited and subsequently calcified. The controversy has, of late, gained importance in that it provides excellent possibilities for the study of the organic composition of the calcifying matrices and their manner of calcification.
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