Wikipedia
Periechocrinus
Periechocrinus is an extinct genus of crinoids belonging to the order Monobathrida, family Periechecrinidae.
These stationary upper-level epifaunal suspension feeders lived during the Carboniferous period and the Mississippian age of Australia, as well as in the Silurian of Canada, Czech Republic, United Kingdom and United States, from 436.0 to 345.3 Ma.