Note: Project Gutenberg also has an HTML version of this file which includes the original illustrations. See 44527-h.htm or 44527-h.zip: (http://www.gutenberg.org/files/44527/44527-h/44527-h.htm) or (http://www.gutenberg.org/files/44527/44527-h.zip) Images of the original pages are available through Internet Archive. See https://archive.org/details/reportonradiolar00haecrich 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. Second Part: Subclass Osculosa; Index see http://www.gutenberg.org/ebooks/44526. Transcriber's note: Text enclosed by underscores is in italics (_Actissa_). A carat character is used to denote superscription: a single character following the carat is superscripted (example: _g_^2). Some typographical errors in the printed work have been corrected. They are listed at the end of the text. 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. PLATES 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. PLATES. CONTENTS. PLATES 1-50. SPUMELLARIA. " 51-98. NASSELLARIA. " 99-128. PHÆODARIA. " 129-140. ACANTHARIA. MAP, SHOWING THE GEOGRAPHICAL DISTRIBUTION OF THE RADIOLARIA. PLATE 1. LEGION SPUMELLARIA. Order COLLOIDEA. Family THALASSICOLLIDA. Fig. 1. _Actissa princeps_, n. sp., × 300 13 The entire living Spumellarium. _c_, The spherical central capsule containing finely granulated protoplasm, which is radially striated in the cortical zone; _v_, spherical vacuoles enclosed by the protoplasm; _n_, the spherical nucleus in the centre; _l_, the concentric nucleolus; _f_, the radial pseudopodia which pierce the calymma or the (yellowish) jelly-envelope of the central capsule and arise from the granular sarcomatrix.