Invertebrate(?) conical spines in Mississippian (Meramecian) Salem Limestone

[pefty]

Could use some help on these 0.5cm - 1cm invertebrate(?) conical spines in the well known Salem Limestone, a marine limestone of the American Midcontinent. They appear to be solid calcite but do not quite match up with the shapes of crinoid spines and echinoid spines that I know from the Mississippian. I have looked at umpteen Salem Limestone samples but have seen these spines at only one small locality.

Any insights appreciated! but please provide your reasoning or evidence.

[Xiphactinus]

Those look like spines on some of the crinoids in the Burlington Mississippian like Dorycrinus...?? maybe??

[abyssunder]

I would go with crinoid spines, as well.