I had better scrutinize all 'sitting sharks'. I will start by considering all on H. As the table below indicates all on side b appear after the calendar has started and none appears after P has finished. Maybe the calendar continues until P is finished? On side a there are just two 'sitting sharks', quite in order as I believe that side b represents the dark side and side a the light side.

1	Hb2-40	Probably these two are 'twins' in some meaning. They are located immediately before those 192 glyphs are starting, i.e. inside the calendar.
2	Hb2-42
3	Hb3-25	Here is the first 'sitting shark' inside those 192 glyphs.
4	Hb4-2	(Hb4-1 should probably not be considered because of its close resemblance with Hb3-42.)
5	Hb4-24
6	Hb5-2
7	Hb5-9	*This shark arrives 17 glyphs after a GD19 type of glyph. In Keiti* (Eb6-19) a similar shark arrives 7 glyphs after GD19.**
8	Hb6-3	This is the last shark of this type inside those 194 glyphs of the calendar.
9	Hb6-51	This is the last shark of this type inside the 250 glyphs of the calendar.
10	Hb9-63	This is a shark that arrives after the calendar but before P has ended.
11	Hb10-41	This unusual shark comes immediately after a GD19 type of glyph. P will end just 10 glyphs (of type P) later.
12	Ha1-26	The shark seems finished.
13	Ha2-37	Though another one appears, similar to Hb10-41 (with jaw now closed). All the other 12 have their jaws open. This one shows its belly (light loured).