Barycrinus stellatus (Troost, 1850) crinoid calyx fossil described in A Critical Summary of Troost's Unpublished Manuscript on the Crinoids of Tennessee by Elvira Wood 1909. Drawings in this post are from Plate 8 figures 6-8 drawn by Major Adolphus Heiman (1809-1862). This crinoid was found in Keokuk horizon of the Tullahoma formation Stewart County Tennessee USA (Mississippian Period). It was assigned U.S. National Museum number 39942 and identified as a holotype. Originally it was called Cyathocrinites steallatus.
Photos are from the Smithsonian collection. The calyx is identified as being 19.5 mm in width.
