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A division of Echini which includes the circular, or regular, sea urchins.

Any edible sea urchin. [Alaska]

y, 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.

ta pellucida). -- Sand dollar (Zoöl.), any one of several species of small flat circular sea urchins, which live on sandy bottoms, especially Echinarachnius parma of the American coast. -- Sand drift, drifting sand; also, a mound or bank of drifted sand. -- Sand eel. (Zoöl.) (a) A lant, or launce. (b) A slender Paci…

One of the smooth areas surrounding the tubercles of a sea urchin.

A sea urchin.

A sea urchin.

A fasciole of a spatangoid sea urchin.

A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.

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.

A genus of heart-shaped sea urchins belonging to the Spatangoidea.

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.

s, 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. Blue tangle. (Bot.)See Dangleberry. -- Tangle picker (Zoöl.), the turnstone. [Prov. Eng.]

A sea urchin when deprived of its spines; -- popularly so called from a fancied resemblance to a turban.

A sea urchin. See Sea urchin.

he hub and spokes of a coarsely made wheel. See Paddlewood. -- Wheel urchin (Zoöl.), any sea urchin of the genus Rotula having a round, flat shell. -- Wheel window (Arch.), a circular window having radiating mullions arranged like the spokes of a wheel. Cf. Rose window, under Rose.