Abstract
Shells were examined from immature snails ( Helix pomatia) that had been treated with DDT or deprived of access to calcium carbonate. Exposure to DDT resulted in shell thinning with the thickness of each of the three structural layers being inversely related to the body burden of DDT. The normal crossed lamellar structure was distorted in some of the thin shells. Withholding calcium carbonate led to similar changes, and DDT may cause thin shells by impairing calcium metabolism.
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