Crinoid stem or segmented worm?

[Ramona]

This is not a fossil that I am familiar with, but I have done some research and it looks a bit like a crinoid stem?  The segments seem fatter than the stems I saw online, but that was as close as I came...  Could it be a bryozoan segment?  I didn't see any of those online that matched it, either...  Found in Huntsville, AL, where I usually find fossiliferous limestone with crinoids and fenestellen bryozoan fossils. 
Thanks!
Ramona

[Ramona]

Closer shot of the fossil.

[Fossildude19]

Looks like part of a crinoid arm, to me. 

[Rockwood]

I can't find anything that looks like crenelations on the plate. 

I'm going to say it's a sponge. 

[Ramona]

12 minutes ago, Fossildude19 said:

Looks like part of a crinoid arm, to me. 

That's kind of what I thought - just couldn't find any online that looked very similar...  Thanks for your help!

 

[Ramona]

7 minutes ago, Rockwood said:

I can't find anything that looks like crenelations on the plate. 

I'm going to say it's a sponge. 

Now THAT is something I can research!  Never thought of that!  Thanks - off to google!