. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. STARFISHES, SEA-URCHINS, ETC. 95 recognized. Some starfish may have thirty or more rays instead of five as in the typical forms. Others may have the interradial spaces filled out nearly or quite to the tips of the rays, making the animal simply a pentagonal disk. Some are very small, less than an inch in diameter, while others attain an extent of three feet or more. The brittle-stars belong to the class Ophiuroidea (Gr. ophis, snake; our a, tail; eidos, likeness). They differ from the. FIG. 35.—A holothurian or se
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. STARFISHES, SEA-URCHINS, ETC. 95 recognized. Some starfish may have thirty or more rays instead of five as in the typical forms. Others may have the interradial spaces filled out nearly or quite to the tips of the rays, making the animal simply a pentagonal disk. Some are very small, less than an inch in diameter, while others attain an extent of three feet or more. The brittle-stars belong to the class Ophiuroidea (Gr. ophis, snake; our a, tail; eidos, likeness). They differ from the. FIG. 35.—A holothurian or sea-cucumber, Cncumar'm frondosa. (About | natural size.) Asteroidea in that the body-cavity does not extend out into the arms as it does in the starfish, or extends at most only into the bases of the arms. The five radiating rays are usually slender, more or less cylindrical, and sometimes branched. The sea-urchins, class Echinoldea (Gr. echinos, hedgehog; eidos, likeness), look quite unlike the starfish. The body is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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