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An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid.

A sea urchin (Goniocidaris hystrix) having very long spines, native of both the American and European coasts. To pay the piper, to bear the cost, expense, or trouble.

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

l the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin.

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

Any edible sea urchin. [Alaska]

he 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.

ellucida). -- 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 Pacific…

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.

Wearing shoes or slippers down at the heel. The shivering urchin bending as he goes, With slipshod heels. Cowper.

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.

r 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.]

An urchin who has soft, whitish hair. [Colloq.]

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