Natural history of animals; . muscles. Their migration causesgreat suffering and often death. The Gordius, or Hair Worm, belongs to the samegreat group of Worms as the Trichina. It lives, whenyoung, in the intestine of the Cricket and Grasshopperbut becomes free when grown up. It lays its eggs inthe water, where it is often found and sometimesthought to be an animated hair. ECHINODERMS, OR STARFISHES. The word Echinoderm means hedgehog-skin, and isgiven to these animals because many of them have theoutside covered with spines, thus reminding us of theHedgehog of the fields, described on page 6
Natural history of animals; . muscles. Their migration causesgreat suffering and often death. The Gordius, or Hair Worm, belongs to the samegreat group of Worms as the Trichina. It lives, whenyoung, in the intestine of the Cricket and Grasshopperbut becomes free when grown up. It lays its eggs inthe water, where it is often found and sometimesthought to be an animated hair. ECHINODERMS, OR STARFISHES. The word Echinoderm means hedgehog-skin, and isgiven to these animals because many of them have theoutside covered with spines, thus reminding us of theHedgehog of the fields, described on page 60. In theEchinoderms the parts are arranged according to areigning number, generally five; that is, the parts ofeach kind are five, or a multiple of five. SEA CUCUMBERS, OR HOLOTHURIANS. The Holothurians, or Sea Cucumbers, have no spines,but are covered with a tough skin capable of great ex-pansion and contraction, and containing particles oflimestone. There are many kinds, varying from an 234 ECHINODERMS: ECHINOIDEA. mmiwwfm. A £ .£ n
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
