Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIIIChapter V. Ontogeny (Individual Development), xciiiChapter 310 wordsPublic domain" VI. Phylogeny (Genealogical Development), ciIII. Physiological Section (ยงยง 201-225), cxxviii