Interesting stuff, don't really know what it is

If you happen to know what any of this stuff is, I'd appreciate it.

Here are my thoughts.

Bottom left - shark cartilage

Top left - crushing fish mouth plate w/ no teeth

Bottom right - fish vert broken down the middle (i have quite a few of these)

Bottom right - 1 over - gill raker?

Top right - 1 over - croplite?