A similar membrane can easily be shown, to surround the fæcal pellets of calanoid copepods, where it often forms a ‘tail’, occasionally of considerable length, at each end of the pellet.

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For example, the abundance of the ctenophore Mnemiopsis leidyi increased and that of the copepod Acartia tonsa decreased in the Chesapeake Bay (Kimmel et al., 2012; Stone et al., 2018), and the ...