Note: Images of the original pages are available through Internet Archive. See https://archive.org/details/reportonradiolar01haecrich Project Gutenberg has the other two volumes of this work. Second Part: Subclass Osculosa; Index see http://www.gutenberg.org/ebooks/44526. Plates see http://www.gutenberg.org/ebooks/44527. Transcriber's note: Text enclosed by underscores is in italics (_Actissa_). Text enclosed by hash marks is in "gesperrt" (wide-spaced) type (#Larcoidea#). Page numbers enclosed by curly braces (example: {25}) have been incorporated to facilitate the use of the Index in Part II. Some typographical errors in the printed work have been corrected. They are listed at the end of the text. The Addenda & Errata (Second Part, pp. 1763-4) have been applied without further comment. REPORT ON THE SCIENTIFIC RESULTS OF THE VOYAGE OF H.M.S. CHALLENGER DURING THE YEARS 1873-76 Under the Command of Captain George S. Nares, R.N., F.R.S. and the Late Captain Frank Tourle Thomson, R.N. Prepared Under the Superintendence of the Late Sir C. Wyville Thomson, KNT., F.R.S., &c. Regius Professor of Natural History in the University of Edinburgh Director of the Civilian Scientific Staff on Board and Now of John Murray One of the Naturalists of the Expedition ZOOLOGY--VOL. XVIII. FIRST PART Published by Order of Her Majesty's Government Printed for Her Majesty's Stationary Office and Sold by London:--Eyre & Spottiswoode, East Harding Street, Fetter Lane Edinburgh:--Adam & Charles Black Dublin:--Hodges, Figgis, & Co. 1887 Price (in Two Parts, with a Volume of Plates) £5, 10s. CONTENTS. REPORT on the RADIOLARIA collected by H.M.S. CHALLENGER during the years 1873-1876. By ERNST HAECKEL, M.D., Ph.D., Professor of Zoology in the University of Jena. FIRST PART.--PORULOSA. (#SPUMELLARIA AND ACANTHARIA.#) EDITORIAL NOTES. The Report on the RADIOLARIA by Professor Ernst Haeckel of Jena occupies the whole of the present Volume, the text being bound up in Two Separate Parts and the Plates in a Third Part. The Report forms Part XL. of the Zoological Series of Reports on the Scientific Results of the Expedition, and is the largest single Report of the series which has up to this time been published. The Manuscript of the Systematic Part was written by Professor Haeckel in the English language, and was received by me in instalments on the 12th August 1884, 13th July and 4th December 1885, and 3rd June 1886. The Introduction was written in German and was translated into the English language by Mr. W. E. Hoyle of the Challenger Editorial Staff; the German text being received in instalments between the 15th July 1886, and the 25th January 1887.