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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..

Urchin :: Urchin (n.) A hedgehog.

Piper :: Piper (n.) A sea urchin (Goniocidaris hystrix) having very long spines, native of both the American and European coasts..

Urchon :: Urchon (n.) The urchin, or hedgehog..

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.

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..

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

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

Spatangus :: Spatangus (n.) A genus of heart-shaped sea urchins belonging to the Spatangoidea.

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..

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

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

Churching :: Churching (p. pr. & vb. n.) of Churc.

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

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

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

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

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

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

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

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