COPEPOD ASSOCIATED WITH A MEDUSA IN JAPAN')

REDDIAH, 1968, from unidentified medusae, P. sewelli REDDIAH, 1968, from the medusa Lychnorhiza malayensis STIASNY, and P. rhizostomae REDDIAH, 1968, from the medusa Rhizostoma sp. To these there should be added P. pacijicum (G.B. WILSON, 1950) from plankton. Since four members of the genus (including the new species described below) are associates of medusae, it seems probable that this association is true also for P. maximum and P. pacijicum, though as yet these are known only from plankton. I am indebted to Dr. Takasi ToKIOKA of the Seto Marine Biological Laboratory for the opportunity to examine the specimens of the new species. The study of the material has been aided by a grant (GB-8381 X) from the National Science Foundation of the United States. The figures have been prepared with the aid of a camera lucida. The letter after the explanation of each figure refers to the scale at which it was drawn. The ab-breviations used are: A1 = first antenna, A2 = second antenna, MXPD = maxilliped, and P, = leg 1. Paramacrochiron japonicum n. sp. (figs. 1-31) Type material.- 7~~, 6c3'c3 ' from one medusa, Thysanostoma thysanura HAECKEL