It has long been known, on the basis of field observations and laboratory experiments, that snails and clams are able to repair breaks in their shells. However, with the exception of Andrews' ('34, '35) excellent work on shell-repair of West Indian gastropoda, and Daniel's ('12) studies, practically all observations have been made upon European mollusks.
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Cheatum, Elmer P.
"Shell Repair In Polygyra Texasiana,"
Field and Laboratory: Vol. 5
Available at: https://scholar.smu.edu/fieldandlab/vol5/iss1/5