Abstract
Ripe animals of Paracentrotus lividus are found at Naples all the year round, but the temperature range for normal development of winter eggs and of summer eggs is different. The winter and summer eggs also behave differently at extreme temperatures. Animal halves of spring eggs at 13°C become animalized in comparison to halves reared at 23°C. In contrast, vegetal halves become vegetalized. As the changes counteract each other the balance between the animal and vegetal systems will probably not be disturbed in spite of changes in the two metabolic systems.
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