Abstract
1. 1. Large aggregates of ribosome-like particles, or “heavy bodies”, bounded by annulate lamellae are formed at the nuclear surface of sea urchin eggs, beginning some time before fertilization and continuing until pronuclear fusion after fertilization. 2. 2. At the time of nuclear membrane breakdown prior to first division the annulate lamellae of the heavy bodies disintegrate in the same manner as the nuclear membrane and the ribosome-like particles become dispersed in the cytoplasm. 3. 3. The possibility that heavy bodies are aggregates of polyribosomes held inactive by protein masking is discussed in relation to current biochemical data.
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