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Excerpt from Medusae of the World the Scyphomedusae, Vol. 3: The Scyphomedusae The present volume is a continuation of the work the two former parts of which dealt with the Hydromedusze. The acknowledgments which I was privileged to render in the introduction to the first volume need not here be repeated, pleasurable to me as such a repeti tion would be. Suffice it to' say that the work was commenced in 1892 at the suggestion of Dr. Alexander Agassiz whose generous aid enabled me to pursue these studies for many years under the most advantageous conditions; and apart from the sense of personal gratitude I cherish toward Dr. Agassiz I hope that enough Of scientific worth may be found within these volumes to cause it to appear that I have made appreciative use of the opportunities he so magnanimously accorded to me. Throughout the years I have hoped that Dr. Agassiz might live to see this work and that he might be pleased by this fruit of his inspiration, but on March 27, 1910, the great student of the oceans died upon the sea, only a few weeks before the publication of these volumes. Since the first two volumes passed under the press I have been most kindly aided by the United States Bureau of Fisheries and by the National Museum of the United States, at Washington. The authorities of the former permitted me to study the important collection of Scyphomedusze recently made by the Albatross in the Philippine Islands, and those of the latter institution were so courteous and helpful as to set aside for my use a table in the Smithsonian building in order that I might study this collection to the best advantage. It is due especially to Dr. Hugh M. Smith, Deputy Commissioner Of the Bureau of Fisheries, and to Dr. Richard Rathbun, Assistant Secretary of the Smithsonian Institution that I owe these highly appreciated favors. Plates 61 and 64a and several text - figures are taken from drawings made from nature by my friend, the late Prof. William K. Brooks. These dra