Abstract
IN 1892 (Journal of Conchology, vol. vii. No. 1) the Rev. R. Boog Watson published a very interesting discussion of the Madeira snails, in which he raised many questions concerning their origin and history, which he did not attempt to answer. Today, we are still groping for light, but I believe we may reach a number of conclusions which are not likely to prove erroneous.
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References
Experiments should be made to determine whether it is even possible for snails protected by epiphragm or operculum, to pass alive through the alimentary canal of birds. Compare Wallis Kew, "The Dispersal of Shells," p. 45.
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COCKERELL, T. Land Snails of the Madeira Islands. Nature 109, 446 (1922). https://doi.org/10.1038/109446a0
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DOI: https://doi.org/10.1038/109446a0
