. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 220 K. SUGIMOTO AND M. NAKAUCHI • .' 3 Days. Colony A K . M "nlnnv R L L_ D I- 1_ U t. L L- 1_ U L? C L L L • L LULL? L M Colony C L L D •— L L L • L_ l-I_ L 1— * \- L_ [_ l_ * L FIGURE 7. Genealogies of three colonies originating from oozooids. Nomenclature of the zooids is taken from Berrill (1940). The end of lines indicates the end of observation of the zooids; D, degeneration of the zooid; M, metamorphosis; solid circle, appearance of gonads. testicular follicles and an ovarian follicle are clearly observable under
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 220 K. SUGIMOTO AND M. NAKAUCHI • .' 3 Days. Colony A K . M "nlnnv R L L_ D I- 1_ U t. L L- 1_ U L? C L L L • L LULL? L M Colony C L L D •— L L L • L_ l-I_ L 1— * \- L_ [_ l_ * L FIGURE 7. Genealogies of three colonies originating from oozooids. Nomenclature of the zooids is taken from Berrill (1940). The end of lines indicates the end of observation of the zooids; D, degeneration of the zooid; M, metamorphosis; solid circle, appearance of gonads. testicular follicles and an ovarian follicle are clearly observable under a microscope in living materials. The sexual phase starts with this stage, but the gonad rudiment appears much earlier. It appears as a mass of lymphocytic cells in the genital tracts around the time when the first bud is formed in the developing blastozooid (Fig. 8A). In living materials so many blood cells are found in the genital tracts that it is impossible to identify the gonadial rudiment, but in fixed material identification is easier. The gonadial rudiment grows as the zooid grows (Figs. 8B-8D). As shown in Figures 9A-9D, the eldest oocyte enters to quick-growing phase about 20 days (18-24 C) after the birth of the blastozooid. In about 5 days the grow- ing oocyte reaches its maximum size, 220 ^ in 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
