Echinoids

[Kcee]

The first 8 are echinoids and echinoid spines, I have seen plenty of photos of them while researching forams.

Doctor Mud.....I can not confirm it but I do think you may be right about the last two being some sort of echinoid, This thing is only about a half a millimeter in size, I can't find anything online that looks like it but will keep at it.

[JohnJ]

1st photo looks like an echinoid spine cross section.  Not sure what the second image is, but there is little evidence of echinoid morphology.  Five photos of echinoid spine fragments followed by two unknowns.