TCD MS 10515 folio 104 recto
individuals attaching themselves to floating debris and being swept downward in the flood. But although large numbers of Lymnea cling to floating twigs and straws, yet to effect a dispersal of their species they are not dependent on a foreign body on which they may drift. For many of these shells float freely of themselves, requiring no attachment to keep them on the surface. In this way they drift about the channels and are carried floating down the main river. This, I suspect, is the chief way by which this species is here dispersed.
One evening* a dark cloud of extraordinary shape, and in fitting unison with the silent desert, appeared on the northern horizon. It resembled in shape and attitude, even
* may 8th