Chapter IV — On the Shape of Shells
014
Plate XLII · Comparative Morphometrics
Form is a diagram of forces
Logarithmic spiral growth constants by genus
Growth constant (k)
φ
0.5
1.0
1.5
1.22
Helix
1.33
Ammonite
1.47
Turritella
1.58
Nautilus
k ≈ φ
1.72
Voluta
1.83
Argonauta
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