These images are quite interesting in that they show possible parasites or byrozoans on a crinoid stem fossil. These fossil was found in Scott County Indiana in the New Providence Formation. It dates to the Mississippian Period.
These might be something like the Wooster College paleontologists found on Jurassic crinoid stems: http://woostergeologists.scotblogs.wooster.edu/2014/11/14/woosters-fossils-of-the-week-a-new-crinoid-species-from-the-middle-jurassic-of-southern-israel-with-a-bonus-parasitic-infection/
Thanks to Kenny for images.