MEDUSAE AND SIPHONOPHORAE COLLECTED BY THE U. S. FISHERIES STEAMER "ALBATROSS" IN THE NORTHWESTERN PACIFIC, 1906. By Henry B. Bigelow, Of the Muiseum of Comparative Zoology, Cambridge, Massachusetts. INTRODUCTION. The medusae and siphonophorae described in the following pages were collected by the U. S. Fisheries steamer Albatross chiefly in the northwestern Pacific, Bermg Sea, the Sea of Okhotsk, and the Sea of Japan during the summer of 1906. The itmerary of the cruise will be found in the Report of the Commissioner of Fisheries for 1906, but for the convenience of the reader the localities of the stations at which medusae were taken are tabulated below. The material as a whole is in excellent condition, and I am indebted to Dr. H. B. Torrey for the use of his field notes. The collection comprises 58 species of medusae and 22 of siphono-phorae, of which only 5 species and 1 variety of medusae are new. But the paucity of the new species is no index to the value of the collection, because two of them are interesting additions to the mesoplankton, while additional data on most of its members are very welcome, and the opportunity to compare them with their nearest allies in the Atlantic has afforded much information of zoo-geographic interest. There are no new siphonophores; but the collection contains a series of the genus Clausophyes previously known only from a frag-ment (Lens and Van Riemsdijk) and from one record which has long been regarded as problematical. The genus proves to be of great anatomic interest. The collection also shows that the species earlier described by me (19116) as "Muggiaea Tcochii Will" is the Diphyes truncata of Sars — a discovery of geographic interest. Proceedings U. S. National Museum, Vol. 44— No. 1946. 69077 ° —rroc.N.M. vol.44— 13 1
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