Fig. 6. Mantle expansion and vertical fin motion (absolute vertical distance between maximum upstroke and downstroke) plotted over a range of swimming speeds for Lolliguncula brevis swimming in both tail-first and arms-first orientations. Data from four size classes are depicted: 1.0–2.9 cm, 3.0–4.9 cm, 5.0–6.9 cm and 7.0–8.9 cm dorsal mantle length (DML). When significant linear relationships were detected, regression lines were plotted, and regression equations, r2 values and P values were included underneath graphs. All error bars represent ± 1 S.E.M. (N=3).