Abstract
ABSTRACT Four mysid species have been found to exhibit responses to changes in hydrostatic pressure. The orientation of these responses has been observed in normal animals, and also in ones from which the statocysts had been removed. The results have helped to confirm earlier work on mysids, and indicate that at least three mechanisms are involved in orientation in this group. These mechanisms are (a) orientation to gravity via the statocysts, (b) the dorsal light reflex and (c) the general position reflex. One of the species used has been shown to respond to slow pressure changes of the same order as those due to tidal rise and fall, and it is suggested that the pressure responses may be important in the tidal migrations of shallow-water mysids.
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