I believe at least three different types of glyphs are involved here. First, at left, is obviously a reversed tapa mea (with a crack in its bivalve shell).

Then we can discern the outline of pure (GD25). This is evident from the glyphs occupying the corresponding locations:

Aa7-3 Aa7-40 (540) Aa7-41 Aa7-51 Aa7-52 Aa7-61 Aa7-62 Aa7-69
1 4 5 6 7

Cfr also Ab1-17--18. But at the top of the right side of the 'bivalve shell' in Aa7-3 it looks as if there was a little hand bent inwards.

…to enter a war canoe from either the stern or the prow was equivalent to a 'change of state or death'. Instead, the warrior had to cross the threshold of the side-strakes as a ritual entry into the body of his ancestor as represented by the canoe. The hull of the canoe was regarded as the backbone of their chief. In laments for dead chiefs, the deceased are often compared to broken canoes awash in the surf ...

And the left side of this 'bivalve' looks similar to the right side in Aa1-26.

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Aa1-26 Ha6-5 Ha6-6 Pa5-51 Pa5-52 Qa5-55