A piece of crinoidal limestone consisting of hundreds of indvidual crinoid stem segments, from the Mississippian Keokuk Limestone of Monroe County, Indiana (PRI 76734). Specimen is from the collections of the [Paleontological Research Institution](http://www.priweb.org), Ithaca, New York. Longest dimension of specimen is approximately 8.5 cm. Model by Emily Hauf.