. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 326 Mr. E. Ray Laiikester on the Hiickel's Monera as Nuda and the Foraminifera as Testacea); 2. Nucleifera [emhracmg Amophou/eaj Gregari'mda, and Catal- lacta); 3. Radiolaria or Cytopliora (embracing the Heliozoa or freshwater Radiolaria, and the Radiolaria proper or marine forms); 4. Infusoria (embracing the Suctoria and Ciliatay excluding the so-called Flagellate Infusoria, which, it seems, should be referred to the Volvocinean Alga?); 5. Noctilucida {Noctiluca and Peridinii
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 326 Mr. E. Ray Laiikester on the Hiickel's Monera as Nuda and the Foraminifera as Testacea); 2. Nucleifera [emhracmg Amophou/eaj Gregari'mda, and Catal- lacta); 3. Radiolaria or Cytopliora (embracing the Heliozoa or freshwater Radiolaria, and the Radiolaria proper or marine forms); 4. Infusoria (embracing the Suctoria and Ciliatay excluding the so-called Flagellate Infusoria, which, it seems, should be referred to the Volvocinean Alga?); 5. Noctilucida {Noctiluca and Peridiniinn). We are indebted to Hiickel's monograph in the ' Jenaische Zeitschrift' (and translated in 'Quart. Journ. Micr. Sci.' for 1869) for the knowledge of the Monera and their reproduction. Prof. Ed. van Beneden, of Li^ge, has given a valuable account of the development and structure of a Gregarina from the lobster (Quart. Journ. Micr. Sci. 1870 & 1871), from which it appears that the reproductive spheroid appears first as a cytode^ and subsequently acquires a nucleolus and nucleus, whilst considerable tissue-differentiation also goes on, though the uni- cellular condition is maintained. The high differentiation of the Ciliate Infusoria is thus no evidence against tlieir unicellular character. The development of the Radiolaria is not properly known in any case. Hiickel, in his great monograph, and more recently Cienkowski (Schultze's Archiv, 1871, and Quart. Journ. Micr. Sci., Oct. 1871) have given some account of the formation of spores, which demonstrate the central capsule to be reproductive like the nucleus in other groups. If the yellow cells should prove to be parasitic, as Cienkowski suggests, then, as in colonies oiMonera or Catallacta^aW the units, with the exception of the central reproductive body, would be of coordinate value. B. The reproductive sphe- roid is at first a nucleated particle of protoplasm; in some cases it develops from a non-nucleated stage. In man
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