Elementary textbook of economic zoology and entomology elementarytextbo00kell Year: [c1915] 94 ECONOMIC ZOOLOGY AND ENTOMOLOGY tically regenerate all the rest of the body. Specimens showing this process are sometimes found on the beaches. Fig. 33 shows such specimens found on the reefs in Samoa. During its development from the egg to the adult the starfish passes through a remarkable metamorphosis. The young when it issues from the egg is more or less ellipsoidal, and is active and free-swimming, being provided with numerous cilia. This larva soon changes to another curious form with FIG.
Elementary textbook of economic zoology and entomology elementarytextbo00kell Year: [c1915] 94 ECONOMIC ZOOLOGY AND ENTOMOLOGY tically regenerate all the rest of the body. Specimens showing this process are sometimes found on the beaches. Fig. 33 shows such specimens found on the reefs in Samoa. During its development from the egg to the adult the starfish passes through a remarkable metamorphosis. The young when it issues from the egg is more or less ellipsoidal, and is active and free-swimming, being provided with numerous cilia. This larva soon changes to another curious form with FIG. 34.—A sea-urchin, Strongylocentrotus franciscaniis, showing movable spines. (Reduced.) many prominent projections. This is so unlike a starfish that the earlier naturalists did not realize that the larvae were in any way related to the starfish and gave them the name Bipinnaria, thinking they were fully developed adult animals. The name is still used in referring to starfish larvae, but we now know that the bipinnaria become, by later development, adult starfish. Other Echinoderms.—All the various starfish belong to the class Asteroidea (Gr. aster, star; eidos, likeness) and although they may differ much in general appearance they are all readily
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