Examples: Gastropods: adding nodules
Large Ostrich Foot (Struthiolaria, pea shape, [2, p. 56])
[alpha=86.9, beta=13, phi=40, mu=0, Omega=30, A=5, a=1.8, b=1.6, L=0.5, W[1]=5, W[2]=5, P=-15, N=26]
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These solid, medium-size shells have a prominent suture and no umbilicus. The whorls are usually nodulous.
The large ostrich foot is a thick, heavy shell with a tall spire and well-marked suture. Whorls are sharply angled where a row of prominent
tubercles encircles the periphery.
Habitat: sand intertidally and offshore, New Zealand.
[2] S. Peter Dance, Shells, Dorling Kindersley, 2002.
