. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. 0 50 100 150 200 0 50 100 150 200 EIZELLE DURCHMESSER (URN) Abbildung 2. Monatliche Größe - Frequenz Histogramme der maximale Eizelle Durchmesser für Neoamphilrite mhnsla von Bodega Harbour, Kalifornien, von Juli 1990 bis Juni 1991. Die bimodale Peaks für Mai und Juni 1991 und Juli 1990, reflektieren Unterschiede in der oozyte Größe - Frequenz distri - butions unter Würmer in den Proben, die nicht innerhalb von Worms. Keine Probe war für September 1990 vor. N, die Anzahl der Frauen in den einzelnen Proben. Von April bis Juli (Abb. 2). Die Brutzeit fällt mit dem Spa

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 50 100 150 200 0 50 100 150 200 OOCYTE DIAMETER (urn) Figure 2. Monthly size-frequency histograms of maximum oocyte diameter for Neoamphilrite mhnsla from Bodega Harbor, California, from July 1990 to June 1991. The bimodal peaks for May and June, 1991, and July 1990, reflect differences in oocyte size-frequency distri- butions among worms in the samples, not within worms. No sample was available for September 1990. N, number of females in each sample. April through July (Fig. 2). This breeding season coincides with the spawning of some individuals in the lab during May 1991. In the oocyte size frequency histograms for July 1990 through June 1991, July 1990 represents the end of the spawning period. In that sample, a single mature female accounts for the peak of large oocytes, and three other worms in the sample contain a few small oocytes. By August 1990, only two worms out of nine examined contained any gametes, and they each had only very early stage oocytes. Proliferation of primary oocytes continues in the population from May to March, with steady growth from October into full grown oocytes and spawning the following April through July (Fig. 2). ANOVA tests show significant differences in mean oocyte diameter among females in the monthly samples (e.g.. October 1990: F = 13.70, df = 4, P < 0.0001; February 1991: F = 12.24, df = 9, P < 0.0001; June 1991: F = 109.80, df = 6, P 300 ^m in diameter present (Fig. 3). Intratu- bular cocoons of larvae of R. californiensis were found in samples from every month sampled between June 1990 and February 1992; in many cases females were still with the broods, and they always contained oocytes of various sizes in their coeloms. While the larvae within each cocoon were at the same development stage, the stages of larval development differed among cocoons in a tube, indicating that the cocoons were laid sequentially. AUG 90. Please note that these image

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