The Echinoid Directory

Nortonechinus welleri Thomas, 1924; Field Museum, Chicago 34711. Lime Creek Shale, Upper Devonian, Rockford, Iowa, USA. Aboral surface showing pavement of covering spines. From Kier, P. M. 1968. Nortonechinus and the ancestry of the cidaroid echinoids. Journal of Paleontology 42, 1163-1170, pls 151-153.

Width of specimen ca. 45 mm.