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Sea Egg :: Sea egg () A sea urchin.

Echinus :: Echinus (n.) A genus of echinoderms, including the common edible sea urchin of Europe..

Auricula :: Auricula (n.) One of the five arched processes of the shell around the jaws of a sea urchin.

Turban-shell :: Turban-shell (n.) A sea urchin when deprived of its spines; -- popularly so called from a fancied resemblance to a turban.

Lithophagous :: Lithophagous (a.) Eating or destroying stone; -- applied to various animals which make burrows in stone, as many bivalve mollusks, certain sponges, annelids, and sea urchins. See Lithodomus..

Repkie :: Repkie (n.) Any edible sea urchin.

Jewstone :: Jewstone (n.) A large clavate spine of a fossil sea urchin.

Sea Urchin :: Sea urchin () Any one of numerous species of echinoderms of the order Echinoidea.

Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..

Sea Hedgehog :: Sea hedgehog () A sea urchin.

Echinus :: Echinus (n.) A name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin..

Fasciole :: Fasciole (n.) A band of minute tubercles, bearing modified spines, on the shells of spatangoid sea urchins. See Spatangoidea..

Regularia :: Regularia (n. pl.) A division of Echini which includes the circular, or regular, sea urchins..

Aristotle's Lantern :: Aristotle's lantern () The five united jaws and accessory ossicles of certain sea urchins.

Sphaeridium :: Sphaeridium (n.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ..

Clypeastroid :: Clypeastroid (a.) Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side..

Siphon :: Siphon (n.) A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.

Semita :: Semita (n.) A fasciole of a spatangoid sea urchin.

Galerite :: Galerite (n.) A cretaceous fossil sea urchin of the genus Galerites.

Corona :: Corona (n.) The shelly skeleton of a sea urchin.

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