Fig. 6. Fibre diameter as a function of bell height. Data are plotted for the inter- (IR), ad- (AR) and per- (PR) radius regions. Regressions for all regions of diameter against bell height were significantly different from zero, but there was no difference between the slopes for the three regions. Data are therefore pooled and a single regression is plotted, along with its 95% confidence intervals (broken lines). The slope of the line is d_f=1.35+0.05h (µm). For the `standard' jellyfish of 20 mm bell height, the predicted fibre diameter is 2.86±1.03 µm.