A Method of Comparing Geographically Distant Snail Populations by Study of Their Shell Composition

Lindsay R. Winkler
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Edward D. Wagner
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Summary

  1. 1) The percentages of organic matter in shells of laboratory-raised Oncomelania nosophora and in those of their field counterparts were determined by both individual and bulk methods.
  2. 2) Simple chemical analyses indicated considerable nitrogen and some amino acids present in the organic material of the shells.
  3. 3) Shells of laboratory-raised snails contained only about one-half as much organic matter as those of field snails.
  4. 4) It is thought that this indicates a possible insufficiency of nitrogenous food in the laboratory culture dishes. This may be due in part to an excess eating of refined cellulose.

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