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3. A rhizocephalan parasite of the crab;Bosohma;Geograpsus lividus. Proc. Sect. Sci. K. ned. Akad. Wet. C,,1965
4. Rhizocephalan parasites of the crab;Bosohma;Pachygrapsus gracilis. Proc. Sect. Sci. K. ned. Akad. Wet. C,,1966a
5. Notes on the rhizocephalan parasites;Boschma;Sacculina bicuspidata and Heterosaccus occidentalis. Proc. Sect. Sci. K. ned. Akad. Wet. C,,1966b-6