Bathyuriscus pygidium about 3cm wide (if it was whole). Marjum Formation, Mid-Cambrian, outside Dugway Utah.
please know that this one was accidentally damaged while I was working on it. I had to glue it back together and sadly I only had super glue. I know that there are better glues to use that can be removed later. I just don't have access to that, so i used what I could.