I found two small fossils, not sure what they are

[Caroboneferous]

I found a couple of small fossils on the Buffalo River in Arkansas.   I was curious to see if anyone had any idea about them.   I’ve posted a group picture and close up shots.  

[Fossildude19]

These look like fenestrate bryozoans, to me. 

Something similar to Fenestella sp. 

[Caroboneferous]

Thanks!  I was thinking bryozoans, but I haven’t found a lot of them in the past.

[abyssunder]

Nice bryozoans, I agree with Tim!