. Animal biology. Zoology; Biology. Fig. 108. -A brittle star, Ophioderma sp. The oral surface. XV2. From a preserved specimen. stimulated. The basket stars are characterized by complexly branched rays ending in tendril-like tips. They are found mostly in water of considerable depth, clinging to masses of seaweed. Owing to the slender- ness of the rays of ophiuroids, they are more likely to be broken than are those of ordinary starfishes. Autotomy is also more frequent, while regeneration is relatively rapid and complete.. Fig. 109.—A sea urchin, Strongylocentrotus drohachicnsis (Miiller). Fro

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. Animal biology. Zoology; Biology. Fig. 108. -A brittle star, Ophioderma sp. The oral surface. XV2. From a preserved specimen. stimulated. The basket stars are characterized by complexly branched rays ending in tendril-like tips. They are found mostly in water of considerable depth, clinging to masses of seaweed. Owing to the slender- ness of the rays of ophiuroids, they are more likely to be broken than are those of ordinary starfishes. Autotomy is also more frequent, while regeneration is relatively rapid and complete.. Fig. 109.—A sea urchin, Strongylocentrotus drohachicnsis (Miiller). From a pre- served specimen. The spines have been stripped from the right half; they and the tube feet show on the left. X %. 236. Echinoidea.—Echinoidea, or sea urchins (Fig. 109), are ani- mals which have lost their rays and possess a skeleton made up of rows. 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 work.. Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.