I remember having seen some similar strange glyphs in the text on the Mamari (C) tablet:

Cb9-29 Cb9-30 Cb10-1 Cb10-2 Cb10-3 Cb10-4
Cb10-5 Cb10-6 Cb10-7 Cb10-8 Cb10-9 Cb10-10
 
Cb10-11 Cb10-12 Cb10-13 Cb10-14 Cb10-15

However, I once upon a time had collected these 4 in GD84 (rona):

rona

Cb10-1

Cb10-2

Cb10-4

Cb10-7

And in contrast to what in C above looks like stages of dying (falling on one's face) those glyphs we are currently studying have evidently not gone quite so far as yet, only becoming old and in need of some recreating rest:

5b
H
Hb5-48 Hb5-49 Hb5-50 Hb5-51 (249) Hb5-52
P
Pb7-31 265 + 32 Pb7-33 Pb7-34 Pb7-35 (300)
Q ...
Qb8-31 (301 + 31) Qb8-32 (666 / 2)

This rare type of glyph cannot be found in my preliminary dictionary for glyph types. Instead we must go to the total documentation of all the glyphs in all the rongorongo texts. There we can find it catalogized as GD115.
GD115

Hb5-49

 Pb7-32 Pb8-8 (336 → 12 * 28)

... The author of the Book of Enoch in his treatise on astronomy and the calendar also reckoned a year to be 364 days, though he pronounced a curse on all who did not reckon a month to be 30 days long ...

 

We could count 8 * 8 (in Pb8-8) and add 64 + 336 = 400 (→ FEBRUARY 4):

 

... The Sacred Book of the ancient Maya Quiche, the famous Popol Vuh (the Book of Counsel) tells of Zipacna, son of Vucub-Caquix (= Seven Arata). He sees 400 youths dragging a huge log that they want as a ridgepole for their house. Zipacna alone carries the tree without effort to the spot where a hole has been dug for the post to support the ridgepole. The youths, jealous and afraid, try to kill Zipacna by crushing him in the hole, but he escapes and brings down the house on their heads. They are removed to the sky, in a 'group', and the Pleiades are called after them ...