Student Project Figures Figure 5 SEM of broken off shell near the shell apex showing broken protoconch. The protoconch is not as thick as the teleconch shell which is derived from three different shell layers.  Excess shell piece blocks off the opening that is formed and compartmentalised by the animal as the teleconch shell develops around the columella. The clockwise development of the shell indicated in red. Photo by Zebilon Kamen Figure 5 Figure 6 Figure 7 Figure 8 Figure 9