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Fig. 7. Successive positions of a particle during repetitive pumping, showing its
position at the beginning of each of 15 successive cycles. The particle was
placed at the mouth (left) at the beginning of the first cycle. The 14th cycle
carried it into the isthmus. In the anterior metacorpus some of the pictures
of the particle are displaced vertically so that each successive position can
be clearly seen, but this is not meant to imply an off-center position.
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