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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Glaucus/The Wonders of the Shore by Charles Kingsley: size of the central group of cells, in a specimen coiled round a
thread-like weed. Underneath this is the same portion enlarged.
When magnified to this apparent size, the cells could be seen in
different states, some closed, and others with their bodies
protruded. When magnified to 3 D, we could pleasantly watch the
gradual eversion of the membrane, then the points of the tentacles
slowly appearing, and then, when fully protruded, suddenly
expanding into a bell-shaped circle. This was their usual
appearance, but sometimes they could be noticed bending inwards, as
in fig. 3 C, as if to imprison some living atom of importance.
Fig. B represents two tentacles, showing the direction in which the
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