Note: Images of the original pages are available through Internet Archive. See https://archive.org/details/reportonradiolar02haecrich Project Gutenberg has the other two parts of this work. First Part: First Part: Porulosa (Spumellaria and Acantharia) see http://www.gutenberg.org/ebooks/44525. Plates see http://www.gutenberg.org/ebooks/44527. Transcriber's note: Text enclosed by underscores is in italics (_Actissa_). The underscore also denotes a subscript, so _c__1 is an italic c with a subscript (note that there are two underscoreds between the "c" and the "1"). 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. 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. SECOND 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. SECOND PART.--OSCULOSA. (#NASSELLARIA AND PHÆODARIA.#) CONTENTS. SECOND PART. II. Subclass OSCULOSA, 889 Legion III. NASSELLARIA vel MONOPYLEA, 889 Order 11. Nassoidea, 895 " 12. Plectoidea, 898 " 13. Stephoidea, 931 " 14. Spyroidea, 1015 " 15. Botryodea, 1103 " 16. Cyrtoidea, 1126