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Fig. 1. (A) Transverse section of the right efferent ctenidial vein of Haliotis
iris filled with amaranth-stained gelatin. Haemocoelic spaces (haem.) and
`lymphoid' tissue (lymph.) are marked, along with the depth (D) and width (W)
dimensions. (B) Velocity flow profile with respect to probe depth range from a
representative animal, showing a parabolic distribution. Points are mean flow
velocities expressed as a fraction of the peak measured velocity.