Student Project Figures Figure 10 Zooid of P. multiclathrata stained with 2,2-bipyridine, from three different angles. Black arrowheads indicate the location of particularly dense concentrations of vanadium-rich cells. Densest concentrations were observed around the oesophagus and in fine rings around each siphon. Scale bar = 1mm.  Figure 9 Figure 10 Figure 11 Figure 12 Figure 13