nechiniteA fossil sea-urchin. Echinites are found in all fossiliferous strata, but are most abundant and best preserved in the Chalk. The term is an indefinite one, these fossils being of various genera, as Goniocidaris, Echinothuria, etc. The Paleozoic echinites form an order Palæchinoidea, represented by such genera as Palæchinus, Eocidaris, etc. See cut under Echinothuriidæ.