. Bulletin - United States National Museum. Science. 152 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251. Figure 59.—Botryllus tuheratus Ritter & Forsyth: a, colony from Amoy; b, arrangement of contracted zooids In a specimen from China; c, mm. long young zooid from the Palau Islands colony; d, inside of prebranchial area of same zooid, showing two tentacles, enlarged. Test soft, gelatinous, translucent to transparent, and may be yellow- ish white or faintly purplish brown. Zooids always pigmented in dark purplish brown and arranged regularly in stellate systems; each system consists of 4
. Bulletin - United States National Museum. Science. 152 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251. Figure 59.—Botryllus tuheratus Ritter & Forsyth: a, colony from Amoy; b, arrangement of contracted zooids In a specimen from China; c, mm. long young zooid from the Palau Islands colony; d, inside of prebranchial area of same zooid, showing two tentacles, enlarged. Test soft, gelatinous, translucent to transparent, and may be yellow- ish white or faintly purplish brown. Zooids always pigmented in dark purplish brown and arranged regularly in stellate systems; each system consists of 4-12 zooids, most frequently 7-10. Colony surface usually exposed, although sometimes it carries some mud. Specimens from Palau Islands and Chinese waters seem to be in budding stages, with darkly pigmented old zooids arranged in stellate systems and all contracted strongly; newly formed young zooids colorless or very lightly pigmented, wholly expanded, situated one at ventral side of each old zooid, filling interspace between systems formed by old zooids, but without forming any systems by themselves and sometimes open- ing to exterior individually. In the colonies from Chinese waters, all zooids have lost communication with the exterior and have buried themselves completely in test. Large old and young small zooids arranged roughly in stellate systems as shown in figure h; probably a stage just before reformation of stellate systems by both old and young zooids. Zooids situated obliquely. Stigmatal rows 4, stig- mata 11-19 in a row and arranged (D=dorsal, V=ventral) : D 4-6. 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.
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