ovoid, and others again more or less rhomboidal. Examined under the high power some exhibit fine circular striations. When treated with acetic acid they dissolve, giving off large bubbles of carbon dioxide, which can be plainly seen with the naked eye. Bibliography. Bouvier, E., 1892. Sur l'organisation des Amphiboles, Bull. Soc. Philom. Paris, 8, vol. 4. Cooke, A. H., 1895. Cambridge Natural History, Mollusca. Cottrell, A. J., 1911. Anatomy of Siphonaria obliquata (Sowerby), Trans. N.Z. Inst., vol. 43, pp. 582–94. Hutton, F. W., 1879. Ann. Mag. Nat. Hist., ser. 5, vol. 3, p. 181. Hutton, F. W., 1882. Trans. N.Z. Inst., vol. 14, p. 156. Lang, A., 1900. Lehrbuch der vergleichenden Anatomie d. wirbellose Thiere (2nd ed.), Mollusca, by Karl Hescheler. MacMunn, C. A., 1900. On the Gastric Gland of Mollusca and Decapod Crustacea, Phil. Trans. Roy. Soc., vol. 193B. Naef, A., 1911. Studien z. generellen Morphol. d. Mollusken, in Spengel's Ergebnisse u. Fortschrifte d. Zoologie. Pelseneer, P., 1895. Hermaphroditism in Mollusca, Quart. Journ. Micr. Sci., vol. 37, p. 19. Pelseneer, P., 1906. Mollusca, in Lankester's Treatise on Zoology. Perrier, E., 1897. Traité de Zoologie. Quoy and Gaimard, 1832. Voyage de l'Astrolabe, vol. 2, p. 196; pl. 16, figs. 1–9. Schneider, A, 1902. Lehrbuch d. vergleach Histologie d. Thiere, p. 570. Suter, H., 1913. Manual of the New Zealand Mollusca, pp. 596–97, Wellington. Suter, H., 1915. Manual of the New Zealand Mollusca, Atlas of Plates, pl. 49, figs. 9, 9a, Wellington.

Art. IX.—Contributions to a Fuller Knowledge of the Flora of New Zealand: No. 6. By T. F. Cheeseman, F.L.S. F.Z.S., Hector Memorial Medallist, Curator of the Auckland Museum. [Read before the Auckland Institute, 20th December, 1918; received by Editor, 30th December, 1918; issued separately, 14th May, 1919.] I. Ranunculaceae. The Genus Caltha in the Southern Hemisphere. A memoir bearing the above title, written by Captain A. W. Hill, Assistant Director of the Royal Gardens, Kew, has recently appeared in the Annals of Botany (No. cxxvii, July, 1918). In this, Captain Hill maintains the subdivision of the genus into the two sections, Psychrophila and Populago, proposed by de Candolle as far back as 1818, and shows that the peculiar development of the leaf-auricles in Psychrophila, which includes the whole of the species found in the Southern Hemisphere, marks off the section much more distinctly than the floral characters proposed by de Candolle. Eleven species are included in the section, three of them being described for the first time. Seven of the eleven are purely American in their distribution, two of them advancing as far north as the Andes of Ecuador or Bolivia; the remaining five extending southwards into southern