No. 8. — -Some Medusae and Siphonophorae from the Western Atlantic. By Henry B. Bigelow. CONTENTS. Introduction List of species Anthomedusae Leptomedusae Trachoniedusae Narcomedusae Scyphomedusae Siphonophorae Geographical distribution Table of stations BibUography Explanation of plates Page. 365 366 367 383 387 390 399 402 428 4.35 436 INTRODUCTION. The Medusae and Siphonophorae described here were collected by the United States Coast Survey Steamer Bache, January to March, 1914, and by the United States Fisheries Schooner Grampus, off Chesapeake Bay, in August, 1916. The itinerary of the cruise of the Bache has been published (1917a); but for convenience, the stations at which Medusae or Siphonophorae were taken are listed (p. 435). The collections were made, and the material preserved, by Mr. W. W. Welsh, of the Bureau of Fisheries, who, in spite of stormy weather, handled this fragile material successfully. The synonymies of the better known species are, as a rule, omitted, full references to the earlier literature on the Medusae having been given by Mayer (1910); on the Siphonophorae by me (1911b).