From figure 3 in: J.M.C. HUTCHINSON, 1989. Control of gastropod shell shape; the role of the preceding whorl. Journal of Theoretical Biology 140:431–444. Abstract, pdf and update.

[Sections down coiling axis of terrestrial snails]

Sections down the coiling axis of (a) Trichia hispida, (b) Oestophorella buvinieri, (c) Cerion glans.

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