Abstract
(1) About 1.03 per cent. of free living Campeloma rufum in the Salt Fork River at Homer Park, Illinois, have sinistral shells. (2) Among uterine young about 5.83 per cent. are sinistral. (3) After birth there is a differential death rate tending to eliminate the sinistrals before they reach an age of one year. (4) Few sinistrals ever reach bearing age. (5) Sinistrality in this species seems to be accompanied by lethal factors.
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