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The medusa is commonly found on the coasts of Japan and is known to proliferate asexually by medusa-budding. Scolionema suvaense is only one member in the Olindiadae, which produces medusa-buds. Because of scanty of literature of the medusan budding the writers will report the results of observations as follows: Materials used here were all collected from Misaki, Kanagawa Prefecture by towing plankton-net in nights all the year round from 1973 to 1974. Preserved specimens in 5 % formalin were used for observation. Medusa-budding The medusa buds can be classified into the following four stages according to the degree of development. Stage I: Medusa nucleus, hemispherical in shape, about 0.1 mm in diameter. Stage II: Medusan structures begin to be formed, especially the manubrium can be distinctly seen, 0.2-0.4 mm in diameter. Stage III: Medusa-buds 0.4-0.6 mm, the mean value being 0.45 mm in diameter, fairly flattened and apparently chrysanthemum-like, tentacles being rolle