Category:Paleechinoidea

Pa`le*ëch`i*noi"de*a, n. pl. Etym: [nl. See paleo-, and echinoidea.] (zoöl.)

Defn: an extinct order of sea urchins found in the paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [written also palæechinoidea.]