Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 OPHIURIOIDEA. 451 through minute holes which cover the whole surface of the animal. Star-fishes often lose one or more of their arms by being dashed against the rocks by the waves, or the arm is bitten off by a fish. In such cases a new one sprouts otit in the place of the old one; and specimens may be found show- ing such ne\v rays in all stages, from those that have just begun to sprout, to those that have nearly reached their full growth. SUB-SECTION V. THE ORDER OF OPHIURIOIDEA OR SERPENT-STARS. THESE
Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 OPHIURIOIDEA. 451 through minute holes which cover the whole surface of the animal. Star-fishes often lose one or more of their arms by being dashed against the rocks by the waves, or the arm is bitten off by a fish. In such cases a new one sprouts otit in the place of the old one; and specimens may be found show- ing such ne\v rays in all stages, from those that have just begun to sprout, to those that have nearly reached their full growth. SUB-SECTION V. THE ORDER OF OPHIURIOIDEA OR SERPENT-STARS. THESE curious echinoderins, which hide under the sea weeds and in the darkest crevices of the rocks of the sea, have long tapering arms which start off abruptly from a comparatively small and a well-defined disk. They thus differ in a marked degree, even in external form, from FlG 682 the true Star-fishes, which have the disk or cen- tral portion comparative- ly large^ and gradually merging into the arms. The name of this or- der is from ofthis, a snake, and oimii a tail ; the arms taper like a snake's tail. The Ophiurans are often called ' Brittle Stars,' because they are Serpent-Star, Ophiopholis bfllis, Lyraan. i • i /. M u 1 exceedingly fragile,break- ing at a very slight touch; and they also readily break themselves into pieces, probably by contraction.
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