Illustration of spiral shell formations (Figure 1), including: (1A) Euomphalus pentangulatus; (1B) Crioceras emeriri; (1C) Ecculiomphalus distans; (1D) Siliquaria anguina; (1F) Stephanoceras humphresianum ammonite; and (1G) Axis of Archimedes wortheri, and their resemblance to similar spiral formations in portions of the human inner ear (Figures 2, 3, 4), including: (2A) cochlea; (2B) osseous labyrinth of left internal ear seen from without; (3) laminae of cochlea; and (4) bony labyrinth of right internal ear of child. From Design in Nature by J. Bell Pettigrew, 1908. Colorized.

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