The Results of Twenty Years of Self-Fertilization in the Pond Snail Lymnaea columella Say

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Abstract
As a contribution to the study of evolution a line of pond snails, L. columella, was started in 1911 and continued to 1931. The snails are hermaphroditic and self-fertilize their eggs. As precautions were taken to prevent cross fertilization, this line of snails formed a pure line in the same sense that the term is used in plants. The snails were kept under standard conditions in 400 cc. of water in a small battery jar. After the 6th generation the spire of the snail became progressively shorter. Although one would expect the inbred line to be less variable than the wild snails, yet this was not the case. There was no significant difference.

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