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Summary
The presence of embryos in the mantle cavity of Tetraclita serrata Darwin, and in Octomeris angulosa Sowerby and Balanus maxillaris Gronovius for comparison, has been monitored. In all species breeding extended over five to eight months, depending on the species. Breeding seasons showed slight variation annually. T. serrata nauplii were cultured on a diet of mussel eggs in the laboratory and the anatomical features of the different nauplius stages are described.