. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORPUS ALLATUM OF NORMAL LEUCOPHAEA 515 emergence the glands begin to grow, but this period is shorter than in females. After about 10 days a peak is reached which, on the average, amounts to a volumetric increase of 2^ times over the initial volume. After this, the values level off to fluctuate only mildly throughout the adult stage. The volume of the largest pair of glands measured in this series ( million p?) is about four times that of the smallest ( million /A3). As one might expect, in analogy to the situation in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORPUS ALLATUM OF NORMAL LEUCOPHAEA 515 emergence the glands begin to grow, but this period is shorter than in females. After about 10 days a peak is reached which, on the average, amounts to a volumetric increase of 2^ times over the initial volume. After this, the values level off to fluctuate only mildly throughout the adult stage. The volume of the largest pair of glands measured in this series ( million p?) is about four times that of the smallest ( million /A3). As one might expect, in analogy to the situation in females, the variability in total nuclear counts is somewhat lower in degree than that in volume, but it is nevertheless considerable (range: 2032 to 7000). Thus, if arranged in the order of increasing volume, male corpora allata also show a gradual increase in the relative amount of cytoplasm. The number of nuclei per ranges from 7696 to 17,131. Inasmuch as male corpora allata are on the average smaller than female, their nuclei are generally more crowded. The highest density occurred in a case (adult age: 51 days) which also had the largest absolute number of nuclei; the corpora allata were of medium size. The loosest arrangement of nuclei was observed in an old specimen (adult age: 396 days) with large corpora allata ( million /x3). The relative cytoplasmic content was almost as high in a male (adult age: 10 days) which had the largest corpora allata in the entire series. Figure 2 shows quite clearly that the rise in corpus allatum volume during the first ten days of adult life is accompanied by an increase in nuclear numbers and a decrease in the number of nuclei per unit of tissue. The reverse trend occurs after the peak, , in males older than 10 days, but as a group these males do not entirely return to the situation characteristic of newly emerged animals. In principle, the male corpora allata show the same relationships between organ size, number of nuclei,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
