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This fissure is overlaid by the carapace, which exactly at this part projects further downwards than elsewhere, and in this way a complete tube is formed. Whilst in Grapsus the water is allowed to reach the branchiae only from the front, I saw it in Ocypoda flow in also through the orifice just described.
And so in reality he was, working his way up by means of his pectoral fins, David supposed in search of some of the minute Crustacea which clung to the roots. Jumping Johnny, having eaten as much as he could swallow, or slipping off by accident, fell back into the mud, when we saw issuing sideways from under the roots a huge crab. David said he was of the Grapsus family.
Of fishes, the variety is great, many of them of splendid colours, particularly the small ones, which feed upon the coral, and seek shelter among its branches. The same place of refuge is chosen by numbers of variegated crabs, more particularly the Grapsus, Portunus, and Galathea.
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