. Bulletin - United States National Museum. Science. 86 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251. Figure 28.— Trididemnum cyclops Michaelsen: a, schema showing section of colony from Gilbert Islands, sta. GOC-41; b, spicules from same colony, X 940; c, right side of thorax of zooid of same colony (tr. transverse muscle); d, abdomen of same zooid. tive zooids, where spicules are found much less dense than in other portions. The superficial spiculeless layer is very prominent over the whole surface of colonies; it is mainly milky white, but faintly purplish brown in some parts along the
. Bulletin - United States National Museum. Science. 86 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251. Figure 28.— Trididemnum cyclops Michaelsen: a, schema showing section of colony from Gilbert Islands, sta. GOC-41; b, spicules from same colony, X 940; c, right side of thorax of zooid of same colony (tr. transverse muscle); d, abdomen of same zooid. tive zooids, where spicules are found much less dense than in other portions. The superficial spiculeless layer is very prominent over the whole surface of colonies; it is mainly milky white, but faintly purplish brown in some parts along the periphery in some colonies, and translucent, although a small amount of fine whitish sand gi-ains are embedded in some places within the layer in the specimens from G0a41. Spicules e32-53/i in diameter, about 40yLi on an average, distributed evenly throughout test from bottom to surface, except the superficial spiculeless layer, densely in specimens from B-8 or somewhat sparsely in specimens from GOC-41, where the reddish-brown zooids are seen through the test. Rays rather short, stout and bluntly pointed at tip; 11-14 rays (specimens from B-8) or 12-17, about 14 on an aver- age (specimens from GOCMrl), on the equatorial plane. Many zoochlorellae, 14-1 ()/x in diameter, found in thoracic lacunae. Zooids rather small, contracted thorax about 500/1, and abdomen about 450/1 in length. Retractile muscle short in specimens from GOC-41, but very long, approximately twice as long as contracted. 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 : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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