Abstract
In the spring and early summer juvenile C. nemoralis rapidly extend the growing edge of the shell, resulting in a decrease in shell and body weights of .apprx. 50% and .apprx. 35%, respectively, for standard sized juveniles. Growth rates of marked juveniles showed 2 distinct phases with respect to size. Maxima occurred at 12-14 and 16-19 mm diameter, the latter peak preceding lip formation. New adults continued to gain in shell and body weight. Most juveniles took 3 yr to become adults, indicating a 5 yr generation interval.

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