. Bulletin - United States National Museum. Science. 260 BULLETIN 15, UNITED STATES NATIONAL MUSEUM. points may agree well in others. Few of the specimens answer to Duncan's description of the color, but the majority have the longi- tudinal white stripe on upper side of arm more or less distinct. Greenish, whitish, gray, and brown tints are more common than red in dried specimens. The arms are often banded with light and dark shades. The radial shields are usually bare, but are often partly, and sometimes wholly covered with the more or less trifid stumps. In some specimens there are no spmes
. Bulletin - United States National Museum. Science. 260 BULLETIN 15, UNITED STATES NATIONAL MUSEUM. points may agree well in others. Few of the specimens answer to Duncan's description of the color, but the majority have the longi- tudinal white stripe on upper side of arm more or less distinct. Greenish, whitish, gray, and brown tints are more common than red in dried specimens. The arms are often banded with light and dark shades. The radial shields are usually bare, but are often partly, and sometimes wholly covered with the more or less trifid stumps. In some specimens there are no spmes on the disk, only the trifid stumps; in others the disk spines are more numerous than the stumps, and the latter are occasionally very few. The relative length of the thorns and the base, of the stumps, and the degree to. Fig. 127.—Ophiothrix X 3. a, from above; 6, feom below; c, side view or two arm JOINTS NEAR DISK. which the thorns are united to each other by membrane vary greatly. In some specimens the stumps are practically wanting and the disk spines very long and crowded; these specimens are so different from typical Tcoreana that I attempted to separate them as a distinct species but connecting links are too numerous to permit one to follow that course. The arm spines are usually slender and some- what tapering, not rarely almost acicular though rough, but they are sometimes stouter and very blunt; occasionally they are flattened; the lowest forms a hook, as described by Duncan, but this very inconspicuous feature is not at all diagnostic, for the same structure occurs to a greater or less degree in many species of 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsoni
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