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

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

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..

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

Urchin :: Urchin (n.) A hedgehog.

Elfin :: Elfin (n.) A little elf or urchin.

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..

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

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

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

Lurching :: Lurching (p. pr. & vb. n.) of Lurc.

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

Urchin :: Urchin (a.) Rough; pricking; piercing.

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

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..

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

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

Pluteus :: Pluteus (n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods..

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.

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..

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