micraster
Mi*cras"ter, n. Etym: [NL., fr. Gr. (Paleon.) Defn: A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.
Mi*cras"ter, n. Etym: [NL., fr. Gr. (Paleon.) Defn: A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.