Student Project Figures Figure 12 Figure 12: Diagram of A. porcata's developmental process after torsion has been completed. Adapted from Underwood (1972), "Spawning, Larval Development and Settlement Behaviour of Gibbula cineraria (Gastropoda: Prosobranchia) with a Reappraisal of Torsion in Gastropods." Figure 10 Figure 11 Figure 12