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Fig. 5. (A–C) Micrographs used to measure the density of jellyfish
microfibrils. Micrographs taken with a video capture system using a 40x
objective on an interference contrast microscope. Samples were allowed to dry
down for an hour before measurements were taken, to facilitate focussing the
microscope. Fibres were branched at both ends, more so at the medial end, near
the gastrodermal lamella. (A) Near the exumbrellar surface. (B) Mid bell. (C)
Near the gastrodermal lamella. Fibre density was determined by counting the
number of fibres crossing the black line across the micrograph. Micrograph
width: 640 pixels=128 µm. Depth of sample: 500 µm. (D) Digital
micrographs taken with a 100x objective on the interference contrast
microscope show that fibre diameter increases slightly with body size. For
improved accuracy, measurements were made with a 15x filar micrometer
eyepiece mounted on the microscope. (Inset) Approximate locations and
orientation of samples are indicated by the coloured boxes: red, A; blue, B;
green, C; magenta, D.
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