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

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

Petalosticha :: Petalosticha (n. pl.) An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid..

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..

Regular :: Regular (a.) Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin..

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

Scrobicula :: Scrobicula (n.) One of the smooth areas surrounding the tubercles of a sea urchin.

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

Corona :: Corona (n.) The shelly skeleton 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.

Coronal :: Coronal (a.) Of or pertaining to the shell of a sea urchin.

Tangle :: Tangle (v.) An instrument consisting essentially of an iron bar to which are attached swabs, or bundles of frayed rope, or other similar substances, -- used to capture starfishes, sea urchins, and other similar creatures living at the bottom of the sea..

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Rosette :: Rosette (n.) Any structure having a flowerlike form; especially, the group of five broad ambulacra on the upper side of the spatangoid and clypeastroid sea urchins. See Illust. of Spicule, and Sand dollar, under Sand..

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..

Urchin :: Urchin (n.) A sea urchin. See Sea urchin.

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

Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

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

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

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