The Echinoid Directory
Polytaxicidaris dyeri Kier, 1958; Museum of Comparative Zoology, Harvard 102078 (holotype). Borden Group, Osagean, Lower Carboniferous, Crawfordsville, Indiana, USA. Cast of oral surface of holotype, from Kier, P. M. 1958. New American Paleozoic echinoids. Smithsonian Miscellaneous Collections 135(9), 26 pp. 8 pls.
Diameter of test 32 mm.