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Studies On Shell Formation in Molluscs

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

1. The posterior wall of the groove and the belt contain a considerable amount of RNA, the low columnar outer epithelium contains much less RNA. 2. The low columnar outer epithelium is rich in glycogen, whereas the groove and the belt are poor in glycogen. 3. The reactions for RNA and glycogen are sharply defined. The sharp boundaries between positive and nearly negative regions with respect to both compounds are remarkable. 4. Only small amounts of proteins, neutral and acid mucopolysaccharides and moderate amounts of phospholipids are present in the shell-forming mantle epithelium. 5. The distribution of RNA in the mantle epithelium warrants the conclusion that the posterior wall of the groove and the belt play a role in periostracum formation. 6. It is assumed that glycogen is involved in the transport and secretion of calcium by supplying the necessary energy.

Affiliations: 1: (Zoological Laboratory, University of Utrecht, The Netherlands


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